Awkward about sex

You don't need to have sex if you don't want to or don't feel up to it. I can see you're anxious about sex. It's understandable. I became very "anti-sex" and actually scared of it when an old ex pressured me into it, than I found out he was cheating. It made me feel like I was worthless and bad thoughts came to mind "Am I fat? Am I not appealing enough?" But after awhile I noticed and came to the conclusion, that it's not me. It was him. He found someone else who caught his interest. Doesn't mean I'm worthless or ugly/fat, just means it wasn't meant to be, and I'll find another who would appreciate me fully. Going back into actually doing sex was scary, not gonna lie. The constant worry of how my body looks or my performance. Maybe speaking it out with the other person can help. Tell them your worries even if you feel that opening up is like you're vulnerable. Sometimes you have to confide and trust someone to try and get over your own insecurities and doubts. You can't always do it alone. Just make sure you are truly ready. Don't want to do anything irrational or something you'll regret later. I hope I helped in some way. - Yasheera :3

All though it's unfortunate that your last relationship had led you to feel that way about sex, you still probably hold a bit of anger against it. What I would suggest is getting comfortable with it all over again, by yourself, remember the good about it, and try to maintain your calmness. Don't give yourself a timeline, it'll all come together when it's suppose to. Don't be too hard on yourself, also don't be afraid to talk about your issue with your new girlfriend, she might have some tips and tricks!

I think you should tell your girlfriend or someone you trust about how you're feeling. Sex is important. I think that if you really have a good relationship with who you're dating right now, telling her what happened could be really beneficial. But you shouldn't point fingers at yourself for being the reason your ex cheated on you. Your ex is the one with the problem, not you. Either that or sex means something different to her than it means to you. That's not your fault.