Yeah telling someone to have more confidence without telling them how is frustrating. I believe everything starts in the mind and the mindset. You have a stutter , thats fact.. so embrace it. You have to know your worthy and that this isn't everything that you are. Confidence is built from successes , no matter how small. Id like for you to break out of your comfort zone and approach a girl you like or just a girl in general. The goal here isn't to get her number or any of that.. its to DO the act. Start small , and keep setting goals that way. Introduce yourself, tell them you stutter. Just by doing this , you'll accomplish something that you wanted to do. I truly believe this will be a great first step.