Is it possible that I have an STD?

So I've had sex a few times. Only one guy though. The most recent time was Sunday, October 7, and before that the last time was in July. I've never had any symptoms before or anything but after I had sex on Sunday I came home & peed right away and it burned. After that it only burned a little and now it hardly does at all. I know people say that's normal, but it's not normal for me. I also had a little blood. I was thinking that it was because it hurt a little when I had sex (cause we were in a weird uncomfortable position) and that I just ripped my vagina a little. But today I had some anal itching & I heard that was a symptom of gonorrhea. I also had some discharge from my vagina. But it was clear. So is it possible that I got an STD from having sex for like 5 minutes. Or could it have been from one of the other times? We also used a condom every time we had sex. And if so how can I get tested with out my parents finding out? I'm only 16 so I need somewhere free.