In general, with whatever you do, you need to think things through carefully and plan what you intend to do....
I know if I were intending to use jumping as a method then I would need a good location, because if I jumped and survived then the outcome could be *very* bad, such as living with very bad disabilities.
I would want to find somewhere that is 300 feet ( 20 floors ) or higher.
Also I would want to be certain I will fall without interruption or landing half way down on a ledge or something.
Plus I would want to make sure I hit something hard, and that nothing could break my fall.
Ideally I would also avoid windy days if possible since that could interfere.
I would also want to make sure I won't put anyone else in danger, e.g. pick a time when nobody is in the area.
Note : As always, please note that I strongly encourage you to seek help with whatever is troubling you. With the right help things can improve. There are many sources of help if you look and reach out. Please seek assistance in any and every way possible. You alone must decide upon your actions and take full responsibility for them, and you should always favour seeking help and keeping out of harm's way.