I'm 16 years old.
I started my period when I was 9.
Ever since about that time, I have had discharge a lot, maybe daily or every other day.
I am not able to wear tampons because it hurts too bad.
I've tried many many times, different ways.
It hurts when I put them in, while they are in, and the most when I take them out.
When I was 14 I had sex for the first time.
It hurt, but everybody's first time does...
I have had sex with the same guy many times in a year,
And he has never been able to go in all the way.
Sex hurts me every single time.
I Bleed a little every time after or during sex.
It hurts so much, that I stopped having it about a year ago.
When I have my period, I get cramps so bad..
I get very nauseous and the cramps are so bad I can't get out of bed.
Mainly when I'm on my period, but sometimes when I'm not on it,
I get these really bad pains in my back where my kidneys are.
It hurts so bad I can't physically move and it hurts to breathe and talk.
I know something is wrong with me,
But I can't tell my parents I've had sex.
I have no clue what's going on...

It's not my area of expertise, but I only have one guess: endometriosis

Endometriosis: Symptoms - MayoClinic.com (http://www.mayoclinic.com/health/endometriosis/DS00289/DSECTION=symptoms)

Reminder that it's only a guess. Do some research on your own.
You do need to see a gynechologist soon.

Having or not having sex should only be between you and your doctor, but I doubt it has relevance.