CDiddy

Well, this is my first post, but I have been poking around these boards for some time, I've done alot of research on my question, but I can't find quite what I'm looking for.

For the record, I am curcumsized, and I am 18.

I need to last longer during sex. My masturbation is quite normal... regularly done. I have tried many upon many penis exercises. I do mean many! And little "tricks" to do during sex. I do take antidepressants, but I heard that is supposed to increase stamina. It is very frustrating.... it is only in positions similar to doggie style that this happens. I can only go for a few minutes. I get so damn excited by my girlfriend(7 months) that I just go too fast. We have had sex MANY times, so it's not that I'm anxious or anything, but I guess I do get a little bit once we get into it really good.
Is there any real help for this? I am very close to talking to my doctor about some prescription drugs, but I am trying everything else before that. I would try some of those dumb pills you see on TV or hear about on Radio ads, but I am not about to experiments around with my penis.

Any help is much appreciated.