Orgasm

I havent has sex yet but when my bf goes down on me after a litrle bit everything tingles and feels really good and then i like kinda jerk away and have him hold me. I physically can't keep going. Is that what an orgasm is i always try to make it go a little longer cause its like 5 seconds but can't. Idk if i need to just keep have him go and not stop or what? I hope this made sense