The other alien I know, he can shape shift, so it might not be a problem.

Well, that was your past self, right? Or alternate dimension self, or whatever. Look, worrying that you used to do, or want to do, something terrible that you don't want to end up doing isn't going to help. Take it from someone who knows, man, it's just going to make you freaked out and paranoid and trying to read too much into every little thing you do.