Same here. I stay to myself only engaging others when it is beneficial and I have no more than a couple of friends that understand me.
I don't want to hurt anybody I simply don't care about most people or the world in general.
I've been betrayed and screwed over by too many people to be able to trust people and I think that anybody would screw me over when it suits them.
In short, I don't know how to give you advice on this matter because I struggle with it as well but I want you to know that you aren't alone