WTF is my problem?

Sometimes I wonder WTF my problem is.
My life isn't perfect or anything and I have been dealt with my fair share of problems over the years, but it's not horrible either.
I have good friends, I've gotten a decent education, I'm fairly intelligent, I have a good family, I have all of the basic necessities, I have some luxuries, I'm going to go to college next year, I'm healthy enough, etc.
But yet I feel awful more often than the average person should...
The majority of my problems come from within, and then I just feel stupid and whiny for having said problems in the first place, and then I get even more upset.
I don't know what my deal is.
I obviously can't seem to handle things in life very well/easily/healthily.
I'm not sure if I'm going to be able to function in the "real world."
Maybe I'm just immature... I don't know. Dard suggested that to me once which pissed me off, but maybe she's right. Maybe I'm just immature/childish/naive.
I always thought that I was fairly mature, but maybe I'm not.
There are a lot of changes that I need to make...mostly changes in attitude/perspective.
I also need a little motivation. I'm certainly not lacking in ambition, but I'm really lacking in motivation.

Well there's my entry for the night.
I have my Latin final at 8. =/