Imagine a time traveller tells you that you are going to kill somebody or commit some other crime and that you are a bad person. Would it sound correct if I said in such a situation the following sentence?
I guess, If I'm going to do that, I really am a bad person.
I should add that I want to convey that I believe I am a bad person now regardless of your opinion on the philosophical question whether I could be called a bad person prior to the actual crime. Besides, I am aware that this is not a "normal" conditional sentence.