I'm really glad I didn't act on these same impulses when I was that age. It's really hard to keep going sometimes, but when you do, I think you'll look back and be very grateful that you never made that mistake. A lot of things seem or appear insurmountable, especially when you're younger, but I promise things work themselves out in some way or another. You just never know what the next day will bring. Even if you don't really think you will ever commit suicide (or even if you do), instead of wasting time thinking about it, do something that will get you out of your routine, even if it sounds stupid or boring. Many times something as simple as this has helped me shake feelings of hopelessness etc...

Having been this low myself, I can tell you that it can always get better, but fundamentally you have to want it to.