@MikeQ this is what I found "Alignment is a tool to help you think about your character's personality and to help explain it to others. If it isn't helping your character, then ignore it.
If your DM is trying to be a jerk about it, and trying to punish you (like having paladins detect alignment and then attack you for not being evil,) then just change your alignment to chaotic / neutral and say, "I do what I want." :)"