Nike has a great marketing slogan "Just Do It" Join Toastmasters (or similar speaking organization) in your area and sign up. Any good coach will tell you thatbif you want to get good at anything, you need to practice. I am a certified training specialist and I travel all over the country giving presentations (mostly 4 hours long) and I've learned to get into a groove. I don't even think about my stutter because I'm having so much fun on stage speaking to medical professionals (doctors, nurses, etc) Step out of your comfort zone and see what amazing things you can accomplish. Good luck !