What's the most effective and least painful methods of suicide?

You've identified your problem; intelligence makes you miserable etc etc leading to depression. Congratulations, you're half way there. Now to embrace or destroy that intellect. To destroy, drink lots of alcohol regularly, and take recreational drugs quite a lot (not too much, if you become an addict that defeats the purpose). Or, go to university and educate that intellect. It may give you pleasure (although I've not met one person this has actually worked for yet, but I'm only 36).

I am too much of a coward to commit suicide. Especially after a friend of mine did it. I know I can't stop you, but you would be putting your problems on everyone else. If this does not phase you then take a bunch of sleeping pills.

Simple answer: don't do it. Every "method" pains someone no matter what - and if you don't believe that, know it'll pain me! Please tell someone about this, and if you want to talk, leave me a comment of your email address or kik or whatever else you may have...

If u care about pain you should not even be concerning yourself with suicide.

By living, until youre going old and natural death comes

A gun in your mouth, not on the side of your head. I heard from a cop that if you shoot yourself on the side of your head there is a significant chance you can survive.

None. Please call a suicide prevention hotline if you're cosidering that.