Am I the only one who only stutters when they talk to people? When do you stutter?

Am I the only one who only stutters when they talk to people? When do you stutter? Hey y’all - I’m 21 and have been stuttering my whole life. Do any of y’all stutter when y’all talk to yourselves? I’ll just be talking aloud by myself and I will not stutter at all but as soon as I’m talking to a person or reading aloud in front of people I stutter every so often. My stutter isn’t too bad, I might stutter once or twice a paragraph, sometimes I won’t stutter for multiple paragraphs. But, I feel like it only happens when I’m communicating with another person. I also stutter a lot when I’m excited or very upset. Feel free to share your experiences :)