Loneliness is not a byproduct of stopping drinking nor is it caused by drinking. They are separate things.
I grew up very very lonely. Stopping the drinking made that feeling more intense. But managing deep emotions is a skill I need to continue to learn regardless of drinking.
Loneliness is never an excuse to drink. Nothing should be.
But I feel for you. Feeling alone hurts and is scary. But we are all here feeling similar things. So for what it is worth we are here with you and none of us is alone.