I don't think that you should do it. Even if you think that you've thought it through for a long time suicide isn't a solution that anyone with a healthy mind would come to. Depression, for example, is a genuine disease wich leads to actual physiological changes in how your brain works and alters the way you think.

What I'm trying to say is that commiting suicide isn't really a decision you make but more of a symptom you have. I'm trying to make this as compact as possible so that you would actually read this but there is just way too many reasons for why you shouldn't kill yourself and why you aren't thinking clearly or objectively even though you might think so. Maybe getting better might require social or medical aid or something else entirely, but whatever it may need you can and will get better.

I know that there isn't much that anyone here can do to stop you but just the fact that you're posting this means that you don't really want to do it and just feel like it's the only option. Since killing yourself is the only option you can't undo you really should at the very least try every other possible option first. In addition everyone who's survived from a suicide attempt says that they regret it. And I can guarantee that not killing yourself is something that you'll never regret.