I was almost extremely introverted in the past. I was the one to listen to others and help the best I could but refused to share...myself. When anxiety and depression first hit me hard, I decided to change my ways. I had to talk about my fears otherwise they'd suffocate me. And funny, I discovered putting 'things' out there did not 'kill' or harm me. I guess true vulnerability is not other people knowing stuff about you. Us being all alone with our doubts, fears, wants, dreams...that's the true vulnerability. Cus they cannot be reflected in the mirror other people are to us, so we stand alone. Doubting it all. Doubting ourselves.
Coming out of depression/anxiety, we're never the people we once were, in my opinion. It's a hard experience, life changing experience. As horrible as it can be, it shows us to appreciate life wonders and makes us stronger.
Not sure if this was helpful but that's how I see it. Wishing you all the best on your journey!