^^ to above, I'm aroace spec! aromatic isn't the only one. I'm Demi-romantic, so I've only ever had crushes on people who I've become close to. When I was a teen, I was never able to crush on some random person I never talked to in school, but all my friends did. I felt like I was weird and that's when I started questioning my sexuality. There wasn't much info on the aro/ace spectrum that I could easily access at the time, so I just assumed something was wrong with me. There's lots of great recourses out there that can help you now! You shouldn't be ashamed to feel this way, it's totally normal. Everyone experiences their sexuality differently.
As for what a crush feels like, I can try to explain?
I started crushing on my partner after we got super close, one day we where talking and then something just clicked. After that, I felt so nervous whenever I even thought about him. Not a bad nervous, but a different feeling. I didn't know what was going on so I went to my friends for advice, and it turned out I had a crush lmao