Anyone ever feel this way?

Hi:) I guess normally I'm a very happy person but lately I feel..I guess depressed. I feel betrayed by my friends 3 of my best friends (guys) all did something to lose my trust in humans. Through their actions I feel as if I no longer trust peoples intentions. I trust people, but I have lost all faith in 'good' people. Also my other best feoends (girls) are guy obsessive and only do something if it involves a guy so most of the time they won't invite me places and it's really starting to irratate me. I just don't know what I should do, who I should trust or even how to approach this. So instead I avoid them all. When possible. I won't go out of my way to avoid them though, but I find myself missing them when they are gone and regrettig the time we are spending together when we are together..what should I do? Have you felt this way? It's hard to describe