I actually completely get where the OP is coming at. I've got no real problem with being that shoulder to cry on, but it's not so much that teenagers have problems in their lives so much as they insist that their problems are worse then everyone else's and it just fucking chips away at my patience. Course, then I tell them a bit about my life and they shut the hell up, but it's everywhere - that emo fat chick crying on the bus, the walls filled with teenagers rolling around in self-pity.
But it's the generation of today, thinking that life should be fair. No idea how it's going to get fix, the whole "shut them the hell up", when I'm actually pretty sure that on some level they want to be fucked up by life - to get the attention and pity of others in their lives, the comforting arms and the knowledge that they are special in life. Eh.
Anyway, I agree with OP. Teenagers suck, and I'm one of them too.