First time

So over the weekend I kinda did it with my boyfriend of 3 years. I say kinda cause idk why but it's like my body was like nope you're not getting any tonight 🙅only some of the tip could get in but not whole thing. It felt like it was being blocked 🤔 I hope this makes sense and I just wanted to know what I could be doing wrong, if I am. Btw we're both virgins. We just laughed at how bad we are, so I'm glad he's cool about it. Things like that name me really happy to be with him 😄 I really wanted to ask someone about this and just even talk about it in general so thanks so much!! 😊