When I was younger, it affected me a lot. I was always depressed, angsty, angry, and quiet. I have a feeling I would have leaned a little ways that way without stuttering, but with it it was worsened. About 25 or so that changed. I learned to not let it slow me down. Sure I'm still a quiet guy, but that means I'm a great listener. When I do talk I try to speak slowly, and it instills calmness is most people who are listening. Talking to people is my job. I worked in the call center industry for almost 15 years and that helped. I'm now a job coach for the state. When I begin conversations I say something along the lines up "I have a speech disorder which causes me to stutter. It doesn't mean I'm nervous or upset, it can just happen. If I do stutter, please don't interrupt or finish my sentence unless I ask you to and I appreciate your patience. Happy to answer any questions about it!" and that has helped me a ton. So it has absolutely impacted my personality in different ways, and in different times of my life. Then, I was quiet, ashamed, and angry. Now, I am quiet, confident, and happy.