Please don't hate yourself. Sure, you made mistakes, but you all were just teenagers at that time. I also was a teenager, I also made stupid decision during those time. And, it was those guys who took advantages from you all.

Have you ever told this matter to your parents? Do you get support from them? I don't know about your local law, but consider that this happened when you girls were underage, I think those guys could be prosecuted for sleeping with underage teens.

I don't know whether it is a good advice or not, but I support your decision for leaving them all. True friend should support each other, not backstab one another. I'm sorry to say this, but clearly your 'friendship' is a toxic one. You have opened your eyes and gained insight to be better person, now you can find a new good environment to grow. You must BE STRONG AND BE SMARTER! Learn from this mistake, so you won't fall into the same pit again in the future.

As for your friends, I think you already know that there's nothing you can do to change their mind, but REMEMBER: it's not your fault. It's their decision to stay, their consequences to get. Just let them be.