unless you happen to have an unsecured and loaded shotgun on you, there's zero guarantee that anything you do to attempt will even work, and most of the easiest readily-available ways will make you live in pain or some level of discomfort for the rest of your life. you'll also likely be taken to a psych ward where you'll be kept physically unable to make another attempt and also be cut off from the internet and everyone you know irl.
that and the fact that life is beautiful.
maybe take a walk, even if it's late at night. things are never as bad as they seem.