What sex position is easiest?

Hi okay so my boyfriend and I are struggling. We have talked a lot about sex and decided to do it the other day. We both lost our virginity to each other. But the thing is

Sex didn’t really work.

I mean, he couldn’t really get it in. I know the biggest part of that is because I’ve never had sex before so I’m really tight.

But what’s the best angle to get it in? And any other tips so I can make it easier for him?

I apologize for how dumb this night sound. Thank you friends!