Well, basically you're asking what to do to decrease your SI, or the major fear a human being can feel: disappear forever. First of all, there's no way to erase it, you'll have to do whatever you decide with its presence; there are ways, however, to interfere in your nervous system, like taking pills for anxiety, drinking alcohol, or using illegal drugs. Biologically, killing yourself is a tough act, once you're going against the involuntary organs that keep you alive, so certainly you - and everyone, I guess - will find some resistance coming from their own individuality.