I have started stuttering from around 12y (26y now). It was pretty hard in school to deal with it. but it was mild case, I was able somewhat to have conversations with friends but I had always to choose right words. But as you age and progress in life, it gets better and better. I am now able to have entire conversations without other side noticing that I actually stutter. But it still happens. It happens in situations when I feel low self esteem, or when I am tired and exhausted, then stuttering occurs. So my story is that, low self esteem is major cause for stuttering. But I don't see it as problem anymore, it's part of my life that I accepted and moved on. But if I would be able to choose to not have it, my entire life would be different, I have missed so many opportunities due to stuttering. But it's life and you work with that you get.