Hi LostandNew,
First off, welcome. To be aware of this fetish (which is a rare fetish, trust me) at such a young age and to seek advice about it is admirable. Keep in mind I'm a couple of decades older than you, so I speak from more experiences, and I'm also coming from the "if I knew then what I know now" viewpoint.
My advice, which runs counter to a lot of what other people are saying here, I know, is to keep it under wraps until you get very intimate with someone FIRST. You are about to embark on an incredible journey, college, where you'll be surrounded by your peers who are all trying to figure out how to socialize with people, just like you. Go to study groups. Volunteer for things. Be a good friend to people. Treat others like you'd like to be treated. Be kind. Actively decide to attend things that you don't have to go to. You'll be surprised how friendships and relationships naturally develop, and with that (it's a side benefit, ha ha), is amazing tickling opportunities. They will transpire, trust me. But don't try to find the the tickling FIRST. If you do this, you might actually find yourself repelling people who might otherwise be good people who should be in your life. You don't want to be known as "the tickling guy" or "the foot guy" just as other people don't want to (probably) be known as "the butt guy" or "the breast guy." Unless you want sex and this kink to be part of your public persona (which works for many people and is totally fine, don't get me wrong), my advice is to keep it private, and live your life first. Once it's out there (that everyone knows your fetish), there's no way to put it back. You can't put the toothpaste back in the tube.
There's another benefit to keeping this under wraps: the "accidental tickles" opportunities (which is a particular side-love of mine). A beautiful, gorgeous foot happens to be within arms reach of you when you're helping to paint a float for a parade or something with a group of friends? Reach over and scramble your fingertips under that arch. If you're known as "the tickling guy" someone might take that the wrong way (akin to grabbing a girl's breast). But if you keep it to yourself, that little tickle, besides the awesomeness of that, might spark something that turns into a beautiful friendship with the girl who's attached to the rest of that foot.
***I'll give you a quick story from my college years many years ago: We were having sort of a "floor party" in our dorm and everyone's drinking beer and just walking around on a Friday night, getting to know each other, popping in and out of other people's rooms. My new roommate and I go into one room and see a girl we know kind of casually, and we're talking with her while she's sitting on her bed Indian style and drinking our beers. Across from her on the other bed facing the wall is a girl with her face in her pillow, body directly face down, wrapped up in a big white sheet/blanket. I knew who it was, this super snotty but SUPER hot chick from New York City with a perfect face, legs and body. (Picture like a tall JWoww from Jersey Shore, but a bit more sophisticated and stuck up). Anyway, I look over at the foot of the bed what do I see but her two bare feet exposed, ankles to toes, perfectly next to each other, touching, toes facing down to the floor. Like, to this day I can remember my heart racing and thumping in my chest harder than ever, looking at those gorgeous exposed perfect soles of this super hot chick, peeking out of those sheets, just begging (in my mind, ha!) to be tickled. She wasn't passed out or anything, she was talking to us through her pillow, making snarky remarks here and there about what we were saying. I wasn't exactly cool or good looking or anything, and I don't know how or why I managed to build up the nerve to do what I was about to do (probably the beer, ha!), but at one pregnant pause in the conversation I put down my drink, walked over to the foot of the bed, waited a second or two to appreciate these stunning perfect soles in front of me, and reached out with both hands and scribbled 8 fingers from the heels to the balls of her two feet, cherishing every millisecond. This confident, alpha-female (and again, super hot female) reacted like she had been electrocuted and let out a huge long laugh and pulled her feet away. It was, to that moment I believe, the greatest tickling experience of my entire life. I just tickled two beautiful soft soles of two perfect, slightly tanned feet attached to a 10-out-of-10 chick (and someone who I'd never get a date with, ha!) for about 2 full seconds but they were the physical best two seconds of my entire life up that point, lol. And the best part was she didn't even CARE! She didn't even turn around to see which one of us did it!! She just laughed into her pillow and pulled her feet away and under the covers, BUT THEN, a couple of seconds later, stuck her perfect bare feet back out AGAIN after we continued our conversation. I'm sure others can relate to this but the only thing better than tickling two gorgeous, soft ticklish feet is to do it a second time. So right before we left, I went over again and scribbled my fingertips in her arches again for a good 2 seconds and got an even better reaction. This time after she caught her breath she looked up to see who was doing it, realized it was someone "not in her league" (me) and mumbled "Dick" while still giggling back into her pillow. We just laughed and left. And I, ah, "cherished that episode" privately in my mind many, many times for the rest of that semester

***
Anyway, my point is, do you see how if I was out there as "a tickling guy" that whole episode might have taken a completely different and potentially negative turn? Alternatively, if we were more compatible people we might have become friends from that little "spark" of casual tickling, you know?
Again, this is just one person's opinion and philosophy on this, and others who are more open about this fetish might have a completely different viewpoint and experiences which I totally respect, but I just wanted to give you an alternate angle: Keep it to yourself, save it for someone you get very intimate with FIRST (that's a whole other discussion, by the way), and just actively and positively live your life.
Good luck out there, bud!