Orgasm

I’ve read about how does it feel an orgasm. I’ve had some incredible feelings and sensations. Still I don’t know if I have had an orgasm. My boyfriend has said I haven’t. When he’s about to finish I’m also like I don’t know how to explain it. Like I gasp and stop breathing and pulling his hair. Is it normal? Is that an orgasm? Someone. I’ve even friend by myself but still nothing. I actually don’t find lots of pleasure when I’m by myself and I’ve friend different things.