I am an 18yr male, I just had my first sex twith a girl who is my age , I was really looking forward to the sex but when we were doing it , i feel kinda boring, and I couldn't get full erection by just looking at her body . I mean like when I watch porn I get full erection really quick. Also I feel a disgusted after sex. I was wondering if I am gay but I have tested out by watching porn that I am heterosexual. So what the hell is wrong with, why do I feel boring during real sex ?