Avoid social relationships – I understand how you might thing this way, but there is one person you need to take care of first, before the others.
And that person is you. You deserve some understanding and support, just like the kind that you have wanted to give to other people.
Think of yourself, first and now. Who could you talk to that would keep your confidence and know something about how things work in the world? You speak like such a good person; is there a special teacher who knows you a little, or a school counsellor?
Counsellor or a doctor would be my choice for you, because they keep your confidences and know all sorts of information about what kind of help there is to offer you, way more than friends who might feel confused at times too. Also, a 24/7 type help line could tell you about things that would help, and all you need is a phone to call and can ask for as much information as you can use.
That is the best advice I can you. If I were with you right now, I would say the same things and hold your hand – but either way, the action to help must come from you. Find someone who knows Who can do What right where you live.
You don’t have to know someone to trust them – approach someone, just like you did here on Quora, but who can tell you about the ways to feel your best. Someone whose job it is to get you feeling better.