Why choke with no masturbation...?

Ok, well I've seen the movie 'World's Greatest Dad' (great movie by the way), and I finally got the whole choking while masturbating thing, but ilwhat I don't get is that I don't masturbate while choking. I discovered choking at around 10 years and it actually felt good (to me) but I never masturbated while doing it. Whay situation dies this put me in? Because I am sorta medically depressed for many reason but I have no intention of killing myself that way. (or do I?) i don't know. Any advice?