Many have a happy smooth exit, but many of us struggle. When we are part of the Org we are involved with a big social scene, bigger than anything else in the community. So you couls volunteer as I have done, or join a drama or knitting club, but it will never be the same as JW.ORG.
My exit has been isolating too, and my daughter has found it hard getting a circle of friends. She is an adult and lives in a different city. But I would never change things. Learning TTATT has been great and the fact I don't have cognitive dissonance anymore has given me more mental stability.
You are not alone in how you feel, it's a terrible cult that practices shunning. I am so sorry you had to go through this in the grocery store.
Take care
Kate xx