Chances of success are really low. Maybe someone was lucky enough for it to work, but the probabilities aren't on your side. Chances of severely hurting yourself and ending up on a psych ward (and if you're from Colombia, like me, you know how shitty they are).
"Jumping from 150 feet (46 metres) or higher on land, and 250 feet (76 metres) or more on water, is 95% to 98% fatal."
Whilst jumping from height can be a very effective method of suicide (providing it is from sufficient height), it does not account for a particularly high percentage of suicides in either the US or the UK. Having said that, in Honk Kong it accounted for over half of all suicides in 20061, so...
lostallhope.com
Reach out whenever you want to. I'm not gonna try to "save" you or convince you life is worth living. But, if possible, I can help you not to do something rash and ineffective.