Questioning

How do i know if I’m asexual. I know it’s something that you know when you know . But I have crushes but whenever I’m out in an opportunity to date or get with someone I get this feeling likw in my throat and gut that I can’t explain. It’s not like disgust but like kind of uncomfortable. I dont know I feel like something is wrong with me like why can’t I just get with someone and like it because its not like I don’t experience attraction at all. I dont know ... help