Whats my problem

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Im nearly 18 and never been able to hold a close friendship for more than 2 years before they abandon me. Ive never really had any reliable friends for the majority of my life and watched as they have had everything handed to them while I talk the few friends I do have out of suicide or take care of them after their abusive dad beat their mom.

Im pretty much universally hated and dont fit in anywhere. Ive always been as supportive and helpful as I possibly can, having to talk a girl out of suicide when I was 13 and having my own stint with suicide and depression around this time last year when my lifeline of a friend flaked on me and girlfriend broke up with me. I always seem to get along with people in their mid-20s and other kids who have mental health issues. Am I just more mature then other kids my age? What is my issue, why am I alone and hated? I dont outright attack others, I get along with others from lower economic areas because they dont sit around bitching about non-issues. I know this post is extremely unorganised but its been bugging me for the longest time wondering why ive never fit in anywhere, any tips?