Thelibrarian
I did just that when I was 17. I ran away to get away from my parents, emancipated myself, and worked two jobs to pay the bills. My parents threatened to put me in homes and institutions when I was growing up because they didn't know how to get through to me (but they never thought of a psych evaluation!! !).
When I was a teenager I was at an impass. I could either go out and spend time with "friends" or stay home with an abusive family that only caused pain, many times physical pain. If I was dealing with abuse at home, which was almost a daily occurrence, I would try to leave the house for as long as possible. Most of the time I would just go hiking alone, but if there were other people involved it was usually the same one person, who I usually bribed with "gas money", and whoever he was hanging out with at the time. Depending on who he had with him, it would usually end up with me quietly observing while he was interacting with them.
I could tell something wasn't right.
I appealed to the two friends who helped me with what I now suspect was a special interest of mine: playing and writing music.
The thing is, when I was with these people, I didn't participate the way everyone else did. They would ask me a question and my response would be short, careful, or non-existent. A lot of the times I would end up being teased by those I thought were my friends for my awkwardness, my difficulty speaking, and my dislike of being touched. (that was a big one for them, they would gang up on me and grab at my sides until I was in a full on rage, which didn't take long.
(I took seven years of mixed martial arts though, so they got at least some retribution.)
I currently share your feelings of not being able to count on anybody. In the past I thought there were friends I could count on, but a lot of the time it turned out I was being played in some way (without me realizing it until much later).