I haven't really focussed on my OC much. I just made something normal-ish in OC creator and called it a day. No backstory. No cutie mark. Essentially, I don't really have an OC, and desperately need to fix that at some point.
I'm not so sure of making my OC a ponysona of myself. I'm usually that guy who doesn't go out much, is awkward in public, and barely gets any sleep at night (causing me to sleep in school and in public). And I talk about music too much. So a ponysona of myself would probably be some exhausted, half asleep zombie of an earth pony smashing his head repeatedly against a computer; with a forever alone face as his cutie mark.
It would be the single most sorry-ass OC ever created. Even red and black alicorn OCs who are captain of the royal guard would look better than mine.