Orgasm?

So my boyfriend and I just started being sexually active. My biggest question is whether or not I’ve orgasmed or not??? I can see that he’s really trying but I just don’t know. Don’t get me wrong, he always ends up hitting the right place and it feels great but then i can never figured if I’ve came or not. I’m always looking it up and trying to figure it out, and it says that you should just know... so I always end up feeling bad and calling it.