What to do when your own family doesn't care about you?

My mother doesn't really help me, my father acts as if I don't exist, my grandparent is the same way as my father and my aunts and uncles. They never done much for me. I see why some people treat their friends better than their family because family means nothing. Just a bunch of people who doesn't give a sh*t. I don't even think any of them really want nothing to do with me. Favoritism plays a role in my family also. I don't have a close relationship with none of these people really, except my mom and three other siblings I grew up with. They are, majority of the time, very negative and depressing. I feel depress and suicidal thoughts occasionally come into play. It's not like they would care if I did commit suicide anyway.