Hi, I am a young male. When I masturbate and my girl gives me oral its vet rare that i ejaculate. As soon as I stick my penis into her vagina I can feel myself ready to ejaculate and cum after about 30 seconds! We have tried starting and stopping but as soon as I start again it's just sitting there ready to explode, I can go for a few thrusts the its ready to go again. We have tried this 15+ by then it's just comes whether I like it or not! It's frustrating for my girl, as she starts to orgasm and then it ends! We try to go again but I struggle to get another erection after that as i think about it too much. I deeply believe this is a mental issue I struggle to relax during sex. Any advise would be appreciated.