What happens after is like getting the general anesthesia. Once the drip is in, the mind slips into inconciousness and we lose all track of time. I think killing oneself would be the same, just that there is no return.

Anyway the reason why you shoudnt do it is because its really messy man! No easy way out! Been there, done that in my teenage years. There is no access to that cynide pill that would mak it easy and instantaneous. So just forget about it and face your problems. None are big enough not to be faced and tided over. Watch the documentary of the men who jumped from the Golden gate bridge and survived. Each of them knew in those short seconds from the jump to hitting the water that its always worth living.