[quirkot]

The only real answer to improve your ability is practice. You might check out Toastmasters to build practice and confidence.

To improve your belief in your ability, practice helps. But there are a bunch of other psychological tricks you can try, just gotta find one that works for you. Like imagine no one is wearing clothes or other things. Personally, I'm a fan of finding a low stakes situation and just absolutely bombing it, doing so bad it's embarassing. Then I know how people start reacting as it gets worse and I can use that as a landmark in a situation where it actually matters