I haven't read any of the other responses so maybe this has already been suggested but at your age, even though you don't attend public school, as a minor citizen whose parents are paying local taxes, you typically have access to the services your local school system provides and or the services of other local agencies. Google " Catholic Services " they are often free of charge and open to anyone.
Start by giving your local high school a call and ask to speak to a counselor. Explain your situation and ask him or her to advise you on how to get help. Tell the counselor the things you've told us here. I'm sure if you got your counselors email address and sent the links to the JW shunning video and the one with everyone in the bunker, they'd realize what you're up against.
Be cautious about all of this so as not to make things worse at home. For the time being even if it takes a bit of searching, you'll have to trust that there is a solution to your problem and the depression you feel will ease up once you are able to take action. Until then don't put too much trust in any of the negative thoughts or hopeless feeling you are having. There are things in life that bother us and need to be addressed but depression is insidious and causes fixable problems to seem totally hopeless. Don't believe it !