Neb, darlin' - everybody is different. Maybe you even have a chemical imbalance that causes the depressions. Maybe you are just very emotional. When I was your age (oh, God! I sound like a parent!!! [img]redface.gif[/img] )...I remember being very depressed to manic depressive for a long time. As I got older, it got better.
Without you going to a doctor to find out for sure, there's no telling why exactly you get down, but I can assure you that your life WILL get better. And you WILL find happiness one day. I just hope I'm there to see it.

I INTEND to be. [img]smile.gif[/img]
*HUGS*