It's a little scary that you're about the same age I was when I first started getting depressive episodes. It took 24 years for them to diagnose me with major depressive disorder. Please keep a close eye on yourself and as others have said, go see a school counselor. If it is something like major depressive disorder,then there's no amount of venting or "sucking it up" that's gonna work because it's a pretty major chemical problem in the brain.

I don't understand these parents these days. It's their job to care for their kids, not ridicule them. It's like when your child comes in with a broken arm and instead of taking them to a doctor you tell them to stop faking it.

*facepalm*