I think I'm crazy!!!?

It sound's like you are very frustrated, and I think a lot of it is from being a teenager. When I was younger, I found out my mom had ms, then my sister went crazy, and a whole bunch of other things. I felt very helpless and sad;and I felt like I should just end it. I felt like that for a really long time, but as I got older(I'm almost 30 now) life started making more sense, things weren't as bad. And I realized hurting myself would be very selfish and not help anything. So no I don't think too much damage has been done. Keep hanging on. Not saying everything is going to be great, but looking back you will see it wasn't as bad as you thought.