Do you speak normally when you're alone?

Do you speak normally when you're alone? Personally, I speak normally and stutter so little when I'm speaking to myself, but when I start speaking with someone, it gets worse. This is why I'm convinced that it's a psychological thing. Am I the only one?? This is so frustrating, like wtf dude. You clearly can speak normally why can't you do it in front of people?? I'm so mad with myself.