Well, if you like it, do it. Nothing bad is going to happen from enjoying tickling, even if it is sexually arousing.
If you feel uncomfortable, then stop. But if you do not feel uncomfortable, then you do not need to stop it. If you enjoy it, it does not matter what the people here think, just do it and enjoy life.
Most of the people here, that feel tickling is very sexual, have had tickling experiences with their family... SO it is not weird. Many guys that do not dare to tell someone about the fetish, can enjoy tickling only when some family member play.
Maybe you would be better with a girlfriend tickling you; but if you do not have one now, there is not really a problem with continuing enjoying tickling by your family.
Some may hate me for this, but it is the true. Tickling is not like if you were having coitus, and getting pregnant... It is not so bad. It is innocent, without risks, and very enjoyable.
I would not tell her, unless you really want her advice. But then probably she will never tickle you again.