I posted about this at great lengths a few years before and the answer to this day is still the same:
NEVER
And the sad thing is... I want to enjoy it so bad. I'm completely envious of those who can enjoy themselves by themselves. The last time I even attempted was when I accept advice here on the boards. I was probably trying too hard at that time, but it's not like it comes naturally for me (pun intended?) I'm very comfortable touching myself, I just derive no pleasure from it. I honestly feel like I'm missing out.