Still a teenager, is everything I'm experiencing just a phase?

AnimeEyes
I won't say how old exactly, but I'm a teen and because of something that happened in my early-teens I became the way I am now.
I've been suicidal, I cut, I make jokes about sexual behavior to cover how it really affects me, I have major mood swings that it's scary for even me, and I'm known for being a happy person because I can't show my depression in front of others -no, I'm incapable of showing my feelings. I break down in tears when I try and because I hate when I cry, I cut.
I take antidepressants, small dosages of codeine (I get major migraines) and the usual pill (not cause of migraines). I'm not sexually active. I have been forced to take anti-depressants because I'd have these 'attacks' (hyperventilating, increase heartbeat, sweating, urge to yell, scream and just die) where I go into a self-harming frenzy just to calm myself, but by then, my arms so cut up skin peels (sorry for the description)
I don't do counseling because I'm afraid of them since they play a major part of making me how I am.
When I first started few years ago, I had suicidal thoughts but never act upon them and I didn't cut (I don't cut for the pain, it's an escape, like those things-->). I use to draw, write, read, anything to take my mind away from my thoughts, but all of that became useless. It just got worse. I'm don't know if I'm bipolar, but I'm not safe. I can be happy with my mum laughing while watching movies one minute, next minute when I'm alone I have a minor or major attack and cut to calm down (the pills don't always help).
What can I do. I hate causing my family problems, what can I do?
Still a teenager, is everything I'm experiencing just a phase?
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