Starvation is the only acceptable way to kill yourself.
You don't make a mess, and you are given plenty of time to consider what you're doing. It's self-destructive, drawn out over a long period of time. You have to be strong and courageous to carry through with it.
So if, for some reason, you feel the need to kill yourself, starve yourself.
No one will ever know that you did it. They'll assume you were trying to look like someone in a magazine. You won't impose on everyone, put anyone on the spot. And you'll still end up the way you want - dead.