What's happening to me?

My whole life is collapsing
I used to be fun, happy and outgoing
Now you have to drag me out of my room
I used to be skinny and I could eat whatever I wanted
I used to have a purpose
But now I'm losing my friends
And I am uncomfortable with my image
I trust too much or not enough
And I never think before I talk
I say stupid things I wish I would shut up
And I don't know if there is anyone I can trust
Some of my friends just wont listen
They tell me to shut up, because they are sick of me
Some pretend they understand and tell me no it's not true
And the others just pretend to listen they nod their heads
And then they find something better to do
And leave me alone with nothing to live for
I try so much to be accepted, but in the end
I realize I'm being used and everything starts over again
I often wonder what it would be like to have no family
if it would be any different
And I just wish I could understand one thing that is happening to me