I recently had my first one night stand with a girl at a bar a week ago and never really thought anything about it. The next day I became worried that I might have gotten an STD because initally the next day I had an itchy rash break out on my back and upper shoulder. That has gone away since then. I don't know anything about STD's so I thought maybe that's a symptom. I've been checking my penis ever since and haven't seen any bumps or redness. However, I don't know if it is my mind playing tricks on me but it sometimes "feels" like a little part of my penis is kind of burning, not really, but maybe. It has been on my mind alot and it seems when it is not on my mind I don't feel a thing and nothing brings my mind to it except for the thought of the chance that I might have something. When I do think it is "burning," I check on it and nothing itches or is red and even when I touch it, it doesn't hurt or anything. I know it could take a while for an STD to show up but I was just wondering it this feeling without anything showing is a symptom. Any suggestions?