What does it feel like to have an orgasm?

I'm pretty new to sex, I've had two partners the first one I had sex with  twice and the second one I've only had sex with once but I have plans to do it many more with him😏. But I don't think I have climaxed with either one of them and so I was wondering what it feels like so that way I know when it happens to me. I mean don't get me wrong my SO knows what he's doing, and it feels so good! But I don't think that I have climaxed yet. Also we were only having sex for about 5 minutes and neither one of us climaxed because his friend started walking in the front door and that killed the mood for me. But anyways help. This is us btw😍