wondering what kind of stutter i have

wondering what kind of stutter i have I tend to stutter on the odd day or so randomly., moreso recently. I have no problem speaking in public at all with anyone, but randomly when im speaking with my friends or family, I have difficulty pronouncing the letter L, R, or S. Its very weird. Sometimes i notice myself kind of tensing when i start struggling to get the letter out. The worst letters for me are L and R. For context, i never noticed myself having this issue until this year, at 22 years old. Weird experience for me, not sure what to do. I also have an underbite and kind of crowded upper jaw if that is something of significance to my case? Is this similar to anyone else?