You are no different. Even if you think you're really good at speaking, there will come time when your heart stops and your palms sweat and you freeze before an audience.
Toastmasters can help with that.
You may be startled to find out how supportive a Toastmasters club really can be. People who think they're really good sometimes come into Toastmasters and find out how unstructured and sloppy they really are. Even if you ARE good, you can always get better. Toastmasters can give you a lot of skills and keep good speakers improving. If you still don't think it's your cup of tea, we'll still be happy you came by.