Of course, this very easily backfires - either you dislike feeling evil, so feeling evil takes up energy and doesn't leave you any to spare for altruistic acts. Alternatively, it might twist your self-image so that you think you actually are evil and start to commit evil acts and become less interested in good ones... or you think that you aren't doing things that are making you feel bad enough yet, so you start doing things that are actually evil.

I expect that getting this to work would require quite an intricate web of self-deception, and most who tried this would simply fail, one way or another.