I don't feel as guilty as I thought I would after doing something illegal.
Why do you feel that way?
No, it's just because I never planned to kill him in the first place.
I understand that you didn't mean to kill him, but it's okay to feel some sense of guilt. Try not to dismiss your feelings, because it could make it harder for you in the long run.
I don't care, I just feel like a bad dude right now.
When you do something wrong most people tend to feel guilty. If you are having overwhelming guilt it might be helpful to seek a counselor.