Make something difficult for yourself every day which will be the scariest thing you do all day. Like a hard workout in the morning.
When you control the scariest thing in the day, the unknown scary stuff becomes less of an obstacle. You become more fearless.
If you procrastinate and are afraid of committing or completing and sharing your work, or interacting, or an interview, big test, or meeting, or anything that stings your heart with anxiety, seize the control by giving yourself the scariest thing to do every single day.
When you control the scaries, they are less scary, and so is everything else.