Everybody experiences some amount of dysfluency. This is why for people with a mild stutter others claim to not even notice it. Dysfluency is normal, and is commonly tuned out. You call it a failure and I would not classify it as such. It's like being short, a naturally occurring condition that does come with disadvantages but doesn't make you any less of a person. I won't pretend to know everybody's condition and situation but it is very possible to live a full and happy life with a stutter. Depression and anxiety commonly accompany stuttering. I find any strain of "well just stop stuttering" or "you're doing it to yourself" to be unhelpful to the point of being detrimental. Anxiety and depression are worse than a stutter, and stutter. We, as stutterers, must accept ourselves, must accept we will be less fluent than others, and must do what we can to find meaning and fulfillment in life (just like everybody else). But I get it, stuttering can be humiliating, especially if people are dicks to you.