Excellent points.

Knowing who you are and what your boundaries are is important. Being an introvert is not a weakness, as much as being an extrovert is not a strength. It's only that extroverts are louder and more assertive, and that way they convinced the majority of people in between that everyone should be an extrovert.

There's a certain amount of evidence that getting over anxiety is harder if you try to do it by doing the thing you are most anxious about.

An alternative is to do things which allow you to become more comfortable with a reasonable degree of personal risk. Which can include things like rock climbing which you do on your own.