I tried to get my virginity. When I go for the condom, it gets soft.

I'm 16 years old, and I've tried to take my virginity twice. I go to my girlfriend's house, we start on the couch (up to that beauty, my penis gets hard), when I take her to bed and I go for the condom it gets soft, I have problem? I am worried.
Expert answer:

It may well be the anxiety of the moment or it may be sexual impotence. Remember to always use protection.