I am sure you have that creative juice within you, so write from your ticklish heart. Try not to write for others' approval, but for their openmindedness.
F/F, you should write what you feel. The first story is always the hardest, so don't try to put everything you want to say into one story. If I were having trouble with a tale, I'd suggest trying something from the first person. Sometimes there's less explaining to do along the way from this viewpoint.
I remember one of my favorite scenes from that '80's classic "The Karate Kid". Miyagi tries to teach his student how to cultivate bonsai trees. His complete tutorial: "Get picture of what you want tree to look like in your mind. You see tree?" "Yes..." "Ok...now make tree like picture."
Imagine something you'd find interesting. Now write it.