I believe it's absolutely possible to "overcome" it to a point where it has a minimal effect on your life. It's never going away completely & will always be something that must be managed, but it can be mitigated to an extent. I've found that (for me at least) deciding to put myself outside my comfort zone & do things that REALLY stressed me out was the best decision I ever made in regards to managing my stutter. I started small. Like really small. Like ordering something I knew I would stutter severely on or answering the phone. Next I'd do something that stressed me out a little bit more like talking to a cute girl or saying something (anything) in front of a group of people. If you keep on a consistent track, eventually that first thing that stressed you out (answering the phone for example) isn't even remotely stressful anymore because you've done way scarier things & lived to tell the tale. I started pushing myself in this way in my mid teens (I'm 29 now) & now I'm a drill sergeant in the United States Air Force with absolutely no doubts in my ability to effectively communicate. I still stutter, but it doesn't stop me from doing anything. I'm in the mind set at this point in my life that if I can be a fucking drill sergeant (a damn good one btw) in the military, there's nothing I can't do. I guess it depends on your definition of overcome, but I feel as if I've overcome stuttering despite the fact that I still stutter.