Im afraid and confused

I (17) have been thinking that maybe I am asexual because I get really nearvous and uncomftable and rrally dislike the idea of having sex. However, I like masturbating. And I don't know what to think nor consider, and I don't wanna apropriate of something I am not. Also I'm afraid of not finding a mate due to this and (eventually) end up diying alone. Can anyone help me?