When an adult or someone comes up to me and asks me a question I tell them the truth but they always think I'm lying when I'm not. When I'm telling the truth I stutter and sometimes skip to another subject. But I don't lie about it. Why?

It's probably your body language, facial expression(s), and how you switch subjects that's the tip off to your listener that you are lying or avoiding the truth. Why do you do that?

I have read your other posts and can see that your version of the truth is lacking, and adults can tell that it is not completely honest. I think you should look at what you tell people and see that leaving stuff out, and changing the subject is exactly what liars do when they don't want to tell the whole truth.