Hi, I think that this question should be under this category.
Well anyway, I'm 18 years old and a virgin, I have this girlfriend and whenever we're together she turns me on but I have trouble getting an erection, is it normal for me to have this problem? I mean, with college and everything else in life I'm kind of stressed and now with this I think I'm trying to hard. Hope to hear from you soon.

Your just nervous. I remember feeling the way you do.
I lost my virginity to my first wife, I was horribly nervous about it, and it was awkward, to say the least.

However when she left me a year later, I met someone new. When it was time for us to have sex, once again, although I was no longer a virgin, I was still very nervous.
But as our relationship progressed it became easier and easier, before you know it, its getting stale, but that's a whole different thread. :)

The point is, if she really cares for you, and you really care for her, you will understand each others view points, and how you feel. If I were you, I would try talking to her about it. If she laughs and finds another boyfriend, then she wasn't worth losing your virginity over.

Sex has to come naturally, anything less won't feel right.