You sound like you're happy. What a laugh.
Existence being a random chance occurence in no way means that life is meaningless.
I already believe in being kind and helpful to others, and no god is necessary for it to be important to me. You have no idea of the consequences of those wrongs that you have done. Your own conscience tells you this. The wrongs have still been commited, the victims are still suffering. And 'searing' over one's conscience seems awfully similar to repenting and feeling better about it.