Hey there,
I have had social anxiety my whole life and drinking because of it...along with being a introvert...
This book I read which I LOVED "Quiet: The Power of Introverts in a World That Can't Stop Talking" - Susan Cain.
The strengths of introverts... people that work corporate jobs that thrive being introverts in a world where extroverts are the "ideal".. people through history that are well known and successful that are introverts etc.
Changed my life in some ways and oddly helped with my social anxiety and panic attacks which kinda stemmed from being shy and a introvert. It gave me some confidence and taught me to look at myself in a much less negative way for being how I am ( introverted, Shy,Social Anxiety) ..
Best of luck!