Here's the thing, some of this may not help you get good hobbies. You may not have internet, or a good relationship with family, and could be anti-social. All this social interaction is too much for your anti-social mind, and that is okay. Sometimes the advice given isn't the advice you need. So, let's start with making friends and other people to confide in, like the teachers or gudiance counselor. You would be surprised how much talking can do find out know things. But maybe you're not a fan of talking, which is fine, but you are going to be pulled from your confort zone a lot due to the fact that you will be expect to at the very least interact with others. Like I have said before, interacting with people is one of the only ways to find out about things you would be interested in, and I say this because you can't go anywhere without an adult. So, instead of generalizing what you could do. I'll try brain ideas of what I think you could do, so I hope this helps.