It depends on what kind of self-control is involved.
I know when to bite my lip, and when to not be extravagant because I've been in situations that could've been life-threatening if I hadn't been rescued (e.g. almost mugged in downtown Berkeley, but was pushed into a halloween store before they were able to grab my purse).
Depending on the person, I usually have extremely good self-control for anger. I can be extremely mad or annoyed by someone, but I can cover it up very well.
When it comes to anger on the road, though, watch out! I have horrible road rage.
Also, when it comes to pleasures, I have a hard time with self-control. I am also one to eat whatever I want whenever I want it. When I wasn't in a relationship (so, a very long time ago...I don't know how I'd be now), if someone I was attracted to was attracted to me, I'd have a hard time with self-control in that way. Not in a slutty way, but just self-control from exclaiming my love for them, haha.