Girlfriend wants me to cum during sex

So I'm .... Weird.. I don't like cumming in front of people. I only him with I'm masturbating and I have to be completely alone, otherwise I still get embarrassed. I just have orgasm embarrassment I guess. The reason behind it is dumb a traumatic but if I feel like I'm about to cum I pull out and stop myself. I don't like moaning during sex so if I feel like I'm going to I slow down. My girlfriend thinks I don't enjoy sex with her but I'm just embarrassed about these things and only want to do them when I'm alone.

Edit: Idk if I would be able to talk to a stranger about how I can't him in front of people... I just see that being very awkward for both me and a therapist...