Oh man, lots of discourse here. I’m asexual and consider myself to have a tickle fetish, so maybe I can weigh in.
The big question is: Do you experience sexual attraction? If yes, you are not asexual. If not, you are asexual. As for what sexual attraction actually is… I guess, do you ever look at someone and desire to engage in sexual acts with them? Including but not limited to, oral sex, vaginal sex, anal sex, mutual masturbation, hand jobs, foot jobs, using a hitachi on her clit?
Now this may confuse a lot of people, but actions don’t necessarily equal orientation. There are many asexuals who still enjoy the physical act of sex, just without any attraction to the actual person (so essentially they’re using them as a walking dildo). So it’s entirely possible that you’re heterosexual with a preference for fetish acts instead of sex.
Personally, I don’t enjoy sex at all. Yes I have tried it, and it was a horrible experience that I’m glad I don’t have to put up with anymore. This was consensual sexual, not assault, but I still found it unpleasant. Sometimes I do get aroused from being tickled, but this never extends to wanting to fuck the person or even wanting an orgasm. I did experience romantic attraction in the past, but rarely do so now. Hookup culture confuses me. Growing up, I wasn’t aware that it was normal to desire sex, or to fantasise about sex with specific people, because I never did.
This is all just my personal experience. Asexuality exists on a spectrum, so the only person that can truly determine whether or not you are, is you. The others are correct that you’re still young and your desires may change and evolve until your brain has finished developing.
Hope this helped.