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I know this feeling all too well! I feel more disappointed and saddened when I sin exactly like I felt as a child when I'd do something I know I shouldn't and the adults in my life that I loved and respected were disappointed in me. I know that they still loved me but letting them down made me sad. I feel the same way about God. I know he loves me no matter what but it bothers me when I find myself doing things that would not please him. I thank him for that feeling because I consider my actions a lot more knowing the shame that I will feel later.