my friends might be fake.

my friends seem like they don't care about me. Yes, they come to me when I cry, but all of it feels so fake. I am sincere with everything I have said to them. But they just don't seem as sincere as I am. I do most of the work on projects, they ask me for favors but don't repay, they blame me for sitting out on activities, saying that I'm too much of a 'chicken', I chickened out, I don't think about the team, I sit out and leave them alone when times are tough. I try to explain to them that I don't feel well, but they don't get it. I help them when they are troubled. I think that out of many, many 'friends', only about 10 of them are real, true ones. Are they as fake as I think they are, or is it just my greed for more?