I have heard preachers over the years give various definitions for repentance. I think it’s a little like love, you’ll know it when you feel it.

But I don’t mean to wax too philosophical. Here is repentance according to God: 

Proverbs 28:13 KJV He that covereth his sins shall not prosper: but whoso confesseth and forsaketh them shall have mercy.

True repentance is not only feeling sorry for your sins or actions, it is also not repeating them.