How to save a life?

I feel weird, disoriented, angry, sad and all the whatever-ness that there is in this world.
I don't know what it is to be someone, anyone. I don't know how people see me. I don't care about it in most of the cases, just sometimes. I don't know how to belong. Or how exactly does it feel to belong. I don't know how it is to be a friend, or to not be a friend. I don't know how to be there for somebody. I don't know how to judge people who're close to me or even remotely related. And I don't know whether that's a good thing or bad. Most importantly, I don't know how to speak out. Or when to speak out, and when not to. The latter is irrelevant as long as the first one exists. I marvel at people who can just speak out anything and everything. I try, try real hard to open up, reach half way there and then something happens and I lose all the interest and enthusiasm. And I won't talk, no matter who it is. Or how much it matters. I don't know how people would react. And I don't know how I would react too. I just feel real dumb. Mentally, and physically too. Like all the fucked up thoughts mingle up and relate and make me sadder.
I think too much, and when these thoughts are sad, they just keep on multiplying.
Need.to.stop.