lol ya know I have the exact opposite problem, I have alot of trouble cumming while I'm with my girlfriend, note that I don't mean getting it up or anything like that lol thats not a problem it just seems like it's really hard for me to cum when I'm with someone else

of course I am a virgin so maybe it's just nervousness or something who knows

I'm starting to think it's a mental thing, that I worry to much about it or that I'm taking to long or something