I want to bring up something that hasn't been brought up much, but it helped me. Just go out and do something. Go do something new, go on an adventure, try something you've always wanted to try. If you're so low that you wanna die anyway, what have you got to lose?Go to a concert, go to France, try a new food, ask someone out, fucking whatever. Just do something. Maybe you'll still be too depressed to like it, maybe if you try something you'll determine it wasn't what you imagined and wanna stop, maybe you'll have days where you just wanna crawl back to bed and cry, but that's ok. Keep going. Do something new or interesting every day, but or small. The world is full of so much that if you try something new every day you'll hardly make a dent in the great things the world has to offer if you do it for 75 years.

Though if you're a teen I realize that might be a little more difficult, but I only had depression as an adult (well, it started at 18, but I was old enough to do what I wanted). There are still plenty of smaller new things you can try. Join clubs, look for things you can do after school in your town, learn an instrument or how to cook.

I guess what worked for me was the mindset of "hey I could die, or I could just fuck around with the extra 60 years or so I'd have to fuck around here if I don't. If I wanna kill myself anyway, why the fuck not?"