Suicide. Relationships/School/Family/et…

I've been depressed since middle school now due to bullying and social problems and its carried on into high school as well. Im a junior now and im much more social and have a lot of friends but still suffering mentally. I had a girlfriend over the past summer that i fell for and though it was short lived she was probably the most important person to come into my life. it wasn't my first gf or anything, i have been in other relationships but i felt like we were so connected and perfect all the time. never fought once. im not sure why but she ended it. right there i lost my best friend i had ever had. she was the only person in the world i ever really felt in tune with. i can't even get along with my own family for the most part and even my other close friends and past gf piss me off. so, i know this sounds stupid... its high school and a dumb relationship but now, seven months later it still bugs me every day. and i don't know why. its not like ive chosen to cling onto it, but the whole experience and the fact that she never talks to me any more even as a friend kills me every day. mentally i can not let it go. she used to also be a place for me to turn when times got rough. a sort of motivation i guess to keep going. now i dont have that and im back into my naturally depressed state and on top of all of this im getting loaded up with pointless amounts of work and my parents are pushing hard for college prep. not that my grades weren't already good. i make high b's and a's and scored a 1910 or so on my SAT. it's not like im going to be homeless but they still won't back off and the pressure of all of this is corroding my sanity. the ONLY time im ever happy anymore, even remotely, is when im at band practice. i front a local metal band and live for music. im trying to get this project going but all the stress is taking away from my time spent on music which is furthering my depression and now for a long time i've been on the serious brink of suicide. i seem to have no interest left in life, i've lost all my energy... i know it probably sounds like typical teen angst or whatever but it goes a lot deeper than that im just not good at writing things out like this.. i need advice