I really need help, related to sexual performance?!

I really need help, related to sexual performance?

I been having this little problem when having sex with my girlfriend, when i get an erection, i put on the condom and 5 minutes during penetration i lose my erection due to no pleasure, which then i'm forced to remove the condom so we can continue our business, because i can't feel anything with the condom on, i've been trying many different labels of condoms, very sensitive, layer thin bla bla bla, and sensitive crap etc and nothing works, been really getting agravated with it, we've been risking a little too much with the non-protective sex. So any ideas would help a bunch thanks =D OH AND I'M only 20 please don't suggest friggin viagra pills. further Thanks!

is she on birthcontrol pills? if nto see if she'll go on em.