Disclaimer my stutter use to be moderately severe, but its getting better and its now mild most of the time, so I'm not sure that people with a more severe stutter would feel the same in this situation. A few months ago, my friend and I made a small film for school (I'm in year 12). On our filming days, I stuttered more than usual. As we went through the footage during the editing, I heard myself stutter when I spoke, but I realised that my stutter wasn't as severe or noticeable as I had thought. It was a bit of a shock. Sure I had heard myself through recordings before, but most of the time I recorded alone in my room, so I rarely stuttered. Hearing myself on a recording where I was speaking (and stuttering) in a normal situation around other people made me realise that the times when I stutter are much more obvious to me than to other people. I think this is because as I speak, I can physically feel when I stutter, like tightness in my vocal chord area. Also, personally I am a bit insecure about my stutter, so similarly to physical insecurities, I focus on it too much and it sometimes stresses me out. I had never understood how my stutter went unnoticed by some new friends or teachers during times when my stutter was somewhat mild or even moderate in severity, because I would still stutter. Whenever I got comments (mainly from teachers) saying they didn't realise I stuttered, I always thought they were lying to make me feel better or something like that. Turns out maybe they weren't. It was a real eye opener, and its made me care a lot less about my stutter. I still get nervous, especially if I'm around new people I don't know well, but I definitely care less when I'm speaking to my friends and family. I hope this helps and I wish you the best of luck with your stutter!