DesperateDan

It has happened to me when I am so attracted to a girl, I just cannot perform.

You are probably just uncomfortable, when you become more comfortable, when you can both act and talk freely as yourselves the rest will follow. Alternately, you could just need to try a little harder for a little longer!

First off, I don't know how old are you, you need to be mature enough to have sex, and that doesn't just mean over the legal age. When you are ready you will know what to do. However, I will continue. The act of sex should flow, you have to turn her on, not agree to "do it" and stick a date in the diary, although this can be done. If you literally have done nothing at all, kiss her, kiss her neck, the more you do the more comfortable you feel doing more, and you will learn by yourself, after all, every woman is different. (in my opinion, a blokes opinion, the knees and elbows are not exactly key sensitive areas of women I have been with, good starting areas are the kneck and shoulders, ears, boobs and inner thighs, feet- yes but many women are self conscious about the smell of their feet or are very ticklish and will prefer you not to go near them, you also want to maintain good eye contact and read your partners face.