As a married person this happens to us girls to. Sometime the build up is just to darn long (not that anyone is complaining) but when the real moment arises nothing seems to work. That goes for girls and guys. Foreplay is important but don't over do it. The lead up can kill the effectiveness of the "parts" if you know what I mean. Fore play, have some fun, it's time, keep it simple. It's worth a try.

Certinly sounds like nerves as well. Talk to your lady about it. Being a vergin is not so bad you know. Your lady has an advantage over you it may seem but she can also mold YOU into what she wants more easily then someone who's been around the block a few times. Definiately talk to her. Find alternitives to finish the job though. Toys tounges what ever. It's no fun to go home stressed.