If we believe that Hashem forgives us when we do teshuva, then what should we do when we still feel remorse after doing teshuva? Isn’t that expected? After all we are forbidden to remind a baal teshuva of their past, because it can cause them shame. How should a person deal with their shame when they remember things they’ve already done teshuva for?
If a person sinned they should be ashamed of what they did, even after they did teshuva. After all they are sorry sbout hat they did, so feeling bad about what happened isn’t essentially wrong, however if it is going to pull you down, and effect your avodas H-sem now, then it is simply yetzer hora. Therefore in your instance it is incorrect.