Hi, im 16 years old and have a problem I have no idea how to deal with, im with a girl now and we tried to have intercourse, it was my meant to be my first time, I put the condom on and then had difficulty keeping it up....We have messed around before and I can keep it up when she is masturbating me etc...This is horrible as im sure this shouldnt happen on my first time, I can get it up on my own but I need to handle it to do so, also if I stop stimulating it for a while it goes soft?....Please help is this a psycological problem or should I see a doctor?

Thnaks alot