Christians, when you know you have an area of weakness or sin?

How do you find the balance in addressing it? Sometimes I feel so self condemning about certain things and try to work on it and fail. Then other times I just kind of condone it in my mind and pretend it's not a problem so I don't have to cope with the feelings of guilt. Don't get all self righteous on me. I know people do this....for example, do you overeat? Do you overspend and indulge in materialism? These are common problems for Christians...