Repent. According to the Amplified Bible, it means: Change your mind for the better and heartily amend your ways, with abhorrence of your past sins.
I think that's a pretty interesting definition. "With abhorrence of your past sins." I'm usually ashamed of myself for sinning, some times much moreso than others. But do I abhor them? Most often not. Usually I feel bad because I know it's a sin and, as a "good Christian", I shouldn't do it. But I don't think I ever hate them as God hates them. Not the things I do. Because I don't do detestable things. Or so I like to think...
So where does the truth lie in repentance? Is it enough to just ask for forgiveness? Is it enough to ask with a sincere desire to change? Some things to ponder, I guess.