Am I asexual ?

Hello, it's been a while that I was wondering something about myself. How can I know if I'm asexual ?
To begin with, I've never watch porn, nor wanted to watch one, never "pleasure" myself and never wanted it either. I dated a guy not so long ago. Whenever, we were doing "adult stuff" I was always trying to convince myself that I was enjoying it, but to be honest I didn't feel anything. Is it because he wasn't THE one ? Or am I asexual ? (I am 20y.o between)
Can someone help me please ? ╥﹏╥