I too recommend Toastmasters, without repeating what's been said, see it as a place to experiment different styles of speaking and a cheap place to fail. I would perhaps not start at a corporate toastmasters at first but a local community one. Also look into Advanced clubs where everyone is very driven about improving. Giving productive feedback through their evaluation program is also a useful skill.

On practise: I don't recall who or which podcast I heard this from but even professional comedians practise a lot. There was a metric of practising minimum an hour for every minute of your speech/act. It's not all about brute memorization, its the fine tuning of little things that make the delivery amazing.

On fear: Even the best still get butterflies. Public speaking is said to be very counterintuitive to our survival instincts since you expose a lot about yourself to a large group of people. Practise lets you manage that fear and fosters more confidence.

I think you'll learn a lot about speaking, and entertainment in general and will gain appreciation for good presentations.

Finally, you'll realize you won't reach out to everyone in your audience. In an average technical presentation, if 25% of my audience felt the content was too complicated, 25% too easy, but 50% just right, then I've succeeded.

Best of luck!

*Edit: typo