How do you know if your having an orgasm?

Jaymi • Hi guys I'm Jaymi :3 I have a boyfriend of 2 years and I'm happily in a relationship :D
I never knew what an orgasm felt like bc I've only had sex with my boyfriend 3 times and I never orgasmed, and that was a long time ago bc I didn't feel like I was ready but I wanna know how it feels like to have one bc I never had one :/