Well when I was in school they always pushed me to join clubs but that's not my thing. If you are in highschool to have more leverage with what science, math, electives ect. you take so you can try to find out what classes are available that are interesting to you. Here's the thing though sometimes in life you have to do things that aren't fun but you do them b/c of the reward at the end. Even adults who enjoy their jobs have things they have to do that are a pain. It's just part of growing up.

I find it rather interesting, the terms you used. "False People," "Backstabbers". Do you know that for a fact? Have been personally betrayed and stabbed in the back by every single one of these people? I highly doubt it. It can be difficult to maintain a positive outlook on people, but people will usually live up to what you expect of them. If you expect them to be false and disloyal, they will in many cases react to you attitude with fallacy and disloyalty. If you expect them to be kind and compassionate, they still may not be. But there's certainly more of a chance of it than if you make negative assumtions about people and situations from the outset. So the best way to handle this would be to simply expect nothing in particular out of the these people and this situation. Once you rid yourself of those expectations as to how people will be and what an experience will be like, you free yourself to stop worrying and simply enjoy the experience of finding out. Try not to see people or situations as "Bad" or "Good", see it for what it is; something with the potential to become either. Go in, be true to yourself and your feelings. Don't be overtly negative and lash otu at people, but don't think you need to walk in grinning like a lunatic either. Just take it as it comes. I know that's certainly not what you want to hear, but it's the best advice I can offer.