This is the verse that popped into my mind when reading your initial post:
Romans 12:1-2
Therefore, I urge you, brothers and sisters, in view of God’s mercy, to offer your bodies as a living sacrifice, holy and pleasing to God—this is your true and proper worship. 2 Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is—his good, pleasing and perfect will.
I've always thought of repentance, not as a "feeling" but as more of a response to new information. A realization or an epiphany. Repentance is realizing you've been going the wrong direction, and making a conscious effort to turn around and go another way. Yes, you may be upset or sad when you see that you've not been going the right away, but It's not necessary.
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“There's such a lot of different Annes in me. I sometimes think that is why I'm such a troublesome person. If I was just the one Anne it would be ever so much more comfortable, but then it wouldn't be half so interesting.”
― L.M. Montgomery, Anne of Green Gables