I may not be the best person to give you advice on this one, since I was 15 when I lost my virginity. But I wonder if you might be putting too much pressure on yourself (and your potential lover) for the first time. At age 33, looking back on my first time, I would have to say it was relatively forgettable .. but it got better! My suggestion -- and this may not be the best advice for you -- would be to just go ahead and get it over with! Don't expect too much from the first time, and once the pressure's off (off of you for having finally done it and off of him for not having to be the one to de-virginize you), then concentrate on making it really good.
Good luck, and let us know what happens!