Don't do it.

First, I'm going to recommend you contact any one of these numbers, you sound more like you need help than anything else.
http://www.suicide.org/suicide-hotlines.html
If you're international:
http://www.suicide.org/internationa.....-hotlines.html

If you're absolutely unwilling to call, at least sleep on it. You'll be much fresher in the morning, and more able to make a clear decision, for better or worse. Make sure you have your affairs in order, take your time doing that.

There are very few good, painless ways to kill yourself. Overdosing on pills and drugs is most likely to just heavily damage your liver than kill you cleanly. Cutting your wrists is messy and extremely painful. If you shoot yourself and miss, you could end up with half a face and significant brain damage.

Don't kill yourself. Shit is never as bad as it seems. But if you absolutely have to, jump off a very tall building or bridge. It has to be very, very high, but if you jump off a skyscraper you will die instantly upon impact, won't feel a thing. You jump off a five story building, you might die, but you might also just break every bone in your body and be stuck in a hospital for months. It has to be a big, massive building or a tall bridge.

But seriously, stop. Call one of those hotlines. Talk to someone. Sleep on it, make sure everything is arranged and your final affairs are in order. That time may give you a way out. There are people out there willing and able to help you. Please, talk to them.

Dude you really need to seek out help

Don't do it, please. Think about your mom and how much she loves you. You are loved whether or not you believe it when it's said. Some people don't know how to reach out and some feel like they can't. But it's not your fault. Just remember that. It is not your fault. I still love you buddy. I genuinely mean that. I know we don't talk as much as we ought to and I know I'm mostly to blame for that. I've become too introverted and it's hard for me to break out of that. But if I could be right there with you this moment to try and help you get through this I would without even missing a beat.

:C hey dude, I really hope you are alright. No matter how shitty things seem, they are usually not as bad once you have a little time to figure things out. Please take care <3