Boyfriend and sex problems.

Hi, I’m very new to this whole situation. I’m only 16 years old and this is my first serious relationship. It’s the first person I’ve ever done anything sexual with. We just celebrated being together for 5 months and we’ve come close to having sex a few times. It’s weird though. We fool around and get really really in the mood to do it and then we both ask if we should and we both say yes. This has happened twice where he goes to get the condom and then all the sudden it’s like he gets too scared. He says it’s like all the sudden when he gets up to get it he thinks that it’s not the right time. He told me leading up to it he’s really ready but when he gets up to get the condom he gets that feeling that it’s not the right time. Is it me? It will be both our first time but I’m scared it’s something I do, I don’t know what to do. I’m not mad in anyway but I just don’t want to pressure him. Please help.