When people talk of the freedom of writing, speaking or thinking I cannot choose but laugh. No such thing ever existed. No such thing now exists; but I hope it will exist. But it must be hundreds of years after you and I shall write and speak no more.
We don't always have an accurate view of our own potential. I think most people who are frightened of public speaking and can't imagine they might feel different as a result of training. Don't assume you know how much potential you have. Sometimes the only way to know what you can do is to test yourself.