Lots of good advice here already. However, I’d like to share a slightly different perspective.
Instead of trying to “overcome” fear, you might want to try learning from it.
Whenever you’re afraid of something, it’s often your subconscious mind looking out for potential threats and bad outcomes.
So it can help to acknowledge the fear, and meditating on what might be causing it.
Instead of trying to get rid of your fear through suppressing it or rewiring your brain, try to learn from the hints it might be giving you.
It’s easier said than done, but you can start small.
Take anything you’re afraid of, try to list down 5 reasons why it might be so, and put them to the test.
Now the outcomes might or might not be desirable. But along the way, you’ll learn to embrace your fears as a warning/guardrail system, and not as an impairment.
And if you just can’t figure it out, do remember that things always get easier with time.
Just try to recall the many times you thought you’d fail horribly or even die. Yet, here you are.
Still alive and past whatever had happened.
Given time, you can toughen up a fair bit.
Anyway, it’s just my two cents. Hope it helps.
And in any case, all the best!