Oh boy, I feel you. I'm also 17, and while I consider myself also asexual, I can totally understand your feelings about relationships. Right now, I'm trying to figure out whether it's cuz society expects me to have a relationship, or because I actually want one. Whatever you decide to label yourself as, just know you're not alone! I'm going through the same thing and it's really freakin hard, but I'm glad that I have this community and countless others on the internet. And in the end, it's ok to not use labels either! You wouldn't be less aro if you decide that maybe you don't want to identify with any specific microlabel.
(wow, this post was a mess, sorry for the rambles)