Serious help needed!!!!!?

I've been depressed since 7th grade- severely. I've been obsessed with death, thought of killing myself and am currently dealing with urges to cut myself and feeling worthless. I've tried everything in the book but it isn't getting better. I'm a freshman now and every feelings still there. My parents got concerned and took me to therapy a couple of times but I'm so shy I just physically cannot tell Anyone. I also cannot write things down because I have a bratty sister who goes through my stuff. I moved to a new school and everything and I still really haven't made friends and it's been six months. I'm just way too shy. I'd love to get a bf or something but a) I'm too shy and b) Every guy is either a hick, gay, taken, or so not my type. I'm seriously in a fix. I'm in a bunch of groups to try to make friends but it's just not helping. I feel lonely, worthless, like a loser and like I am going nowhere in life. Please help!!!!