Welcome to the community Brown. I also used to struggle a lot with Approach Anxiety. I still sometimes get the flutter in my stomach, but it is more of an adrenaline rush for me to go up to girls.
I used to go door to door for 3 years, and that really helped me out. Then I got into PUA stuff and it has helped me with approaching girls specifically. Now I do it for fun.
Good luck with your new journey. Have you read any books written by renown mpua's yet? I suggest it, you will learn a great deal that way. You just have to make sure you start putting the techniques you learn into practice. The field is the only place that one can truly improve.
Also, the best Mindset to have is "This is your reality, others are just guests in it that are looking for YOUR approval."
-Tropics