Does anyone experience this?

Does anyone experience this? First of all I want to apologize in advance if I make any grammar mistakes, english is not my first language. I write here because I experience what I think is psycological stutter or something like that. When I talk to myself i do not stutter at all, but the second I start talking to someone (even if I totally trust that person) I always stutter. Is this something psycological? Does anyone found a way to stop it?