Hi,
Sorry this has happened to you, and you're feeling like this.
First things first, I know it's easier said than done, but please try not to give yourself a hard time over this, we all make mistakes... the important thing is to learn from them. Not sure if you used protection, but if you didn't, I would suggest you get yourself tested. If that comes back with the all clear, then just draw a line underneath this and put it down to experience. Obviously take lessons from this, and be more selective about who, where and when you get intimate with.
If & when you get a new partner, it's always a good idea to still spend some time with your mates, as they'll be the ones who are likely to be there for you when it ends or things go wrong. What's the woman equivalent of "
Bro's before Ho's?" Is it "
Chicks before d***s?" lol Maybe, maybe not... but you get the idea.
Personally, I didn't got to a six-form, but I went into college after school. The one thing I liked about that was that it allowed me to make a fresh start, and leave every thing that happened in high-school in the past where it belongs.
A sexual relationship is something very personal, and it's up to you who you choose to tell about it. Unless it's someone you're about to do the dirty deed with, your sexual history is, frankly, none of their business. If asked, you can just say you were seeing someone between "X" and "Y" dates; chances are they won't ask more than that.
In the mean time, you may want to try re-connecting with your other friends. Was the "
friend" you told part of that group? If so, is she influential & is she likely to gossip about you? Even if she does, I'm sure there will be at least one person in the group who won't be judgemental or sanctimonious with you?
Worst case scenario, new term starts in the beginning of September, so you're clearly over the worst of it... only a couple more weeks and you've got the chance to make a fresh start.
Brand new environment, brand new you