I'm 18 and my girlfriend and I have recently started dating, and it's been a little over a week. Well in that time we've had sex and done other sexual things like 80% of those nights. One night we had sex and my girlfriend said she can't cum, and it frustrates her. She said when we started the first few times we did anything sexual she came, but she says now it starts to come on, but she doesn't actually cum. She says she feels like she needs to, and I feel like she might be putting a lot of pressure on herself. I want to be able to help her cum, because then I would be happy for being able to get her off. She says she enjoys everything so much, but she can't seem to get off. We have tried some different positions and things. I'm just wondering if anyone has some advice on how to get her back to being able to cum, and get her to finish during sex. Maybe she's just too stressed about it, but I don't know. Any help would be much appreciated.