Could this be the reason for my depression?

[Showjumper123]

A month ago I got Diagnosed with depression, the dotcotors wont help so im not getting any treatment. Up untill recently I couldn't think of a reason for my depression other than in the winter I finally decided to trust someone, feel in love with them and then got let down, I'm still friends with the guy.

Basically i was looking back over my life and trying to find the reason behind my depression and this is what I think may have caused it:
A few years ago I was looking after a friend who is a couple years younger than me, we went down to the park, he pushed me onto the ground (although he done it in a friendly, jokey way) but then he started trying to pull down my trousers and finger me. I Never told anyone about this, considering i was older than him it must have been my fult, I should I had more control. I 'forgot' about the incident and just got on my with my life.
At the start of this academic year a similar thing happened, although he didn't finger me just tryed to touch innapropreatily and stuff... This sort of brough up bad memories.
Iv always had trust issues and at the start of the year I finally fell in love, the guy knew I had trust issues and after falling for him he decided to say that he didnt want a relationship, after leading me on. Great. I spend all my time thinking about ways to make him happy, make him fall for me. Additionally, his best friend uses me to wank over, which doesn't help my self Estem.
I guess I feel like I'm worthless, no one cares all people see me as is an object, they just ant to use me. I'm weak and I let people use me because I'm nothing better that that, I'm not good enough, I guess I detected to be wabked over and forced on. I'm weak and ugly.