Welcome to SR treeline. Congratulations on seeking a new life.
I'm shy too, and used alcohol to help with social anxiety. It certainly did backfire! In the end, all I wanted to do was stay in my little cocoon and drink. Using alcohol to get numb & feel better about things doesn't work. I wish it hadn't taken me so long to realize it.
I hope you'll stay here with us and find the courage to stick with your plan to quit. Being here and getting help & suggestions made all the difference to me. I wouldn't be 2yrs. sober without SR.