Sex troubles

So last night me and my bf tried to have sex for the first time and it didn’t go so hot,

The issue being we couldn’t get it in. He’s not particularly big, average size, so I don’t think that was the issue. We were also both pretty tired and so he wasn’t really getting quite all the way as hard as he normally is so idk how much that affected things. I’ve had sex one before where this was an issue but we made it work fairly quickly. Idk if my pussy is too tight or something or tilted in a weird direction because at one he got in in but could only go about 2-3 inches in.

Please help it was so frustrating and upsetting and idk what the hell to do