It's true that it could be worse, but it's healthy to allow yourself to feel bad about things in your life for periods of time - someone always has it worse, but that doesn't negate your feelings :) I also struggle with looking back on my life and seeing all the things I really missed out on, but at the same time, I do consider my stutter to have shaped me into the person I am, which I am thankful for, even if I struggle sometimes.