I need some uplifting advice?

Well first off, my girfriend and I just broke up about 2 weeks ago and
I am still pretty upset about it. It seems as if I think about her all
the time when I know she doesn't think of me because she's out having
fun with other guys. What has also been on my mind is that I feel that
I will never find a true love. The girlfriend that I just lost was my
first love so it devistated me when we broke up. I am very insecure
and have almost no self-confidence. Also I am very shy around people
that aren't my friends and I tend to think people look at me to be
awkward. Now this is going to come out of nowhere but here goes
nothing. I am almost positive that I have an STD. I had it before my
last girlfriend and yes we had sex. And yes, she knew I had it. She
said she didn't care because she wanted to live the rest of her life
with me but that didn't happen. What I am trying to get at here is
that I have not told anyone about this because I am, I guess, afraid
to. I feel that it would get around to people and they would think I'm
gross or something. I'm only 17 years old and I have an STD and I feel
that if I do ever meet a girl that she would not want to be with me
because of it. Some of my friends have been having parties and I've
been going and I think one of these times I'm going to have sex with a
girl and I'll be too drunk to tell her I have it and she will get it
and I would feel terrible. I don't know what to do. I am a bit
depressed because I feel like what I have is keeping me back from what
I want to do. Not that I'm a sex addict but you just never know when
you will meet that special person and have to worry about giving her a
nasty disease. I honestly don't even know how I got it... I just want
some uplifting advise about all of this (my girlfriend, STD, how to
move on,). Just anything to make me feel better.