I think some of the previous posts have touched on this, so I'll just expand on it a little...
Defining ones self as an ex-JW, or an ex- anything is looking backwards, not forwards. We are all to an extent the product of our past, but we don't have to be defined by it. If our past is less than we might have wished for, we can rise above it, we can grow, and become something greater than what we used to be.
One stops growing when one stops learning. Don't let the end of your JW experience be the end of your lifes learning experience. If nothing else, you have learned where you don't want to be, now find somewhere you DO want to be. It doesn't have to be a religious organization, or even an organization at all.
Go to a bookstore, and browse through whatever seems the most interesting section of the store. See if a title jumps out at you. Or check a local newspaper concerning upcoming events in your area, and see if something you'd like to attend is coming up. Continue to have your eyes and ears open for things that might appeal to you.
Keep doing this until you find something you really enjoy doing, something which you actually look forward to participating in, something which makes you feel good about yourself.
Then you can define yourself by your present, and expected future, rather than by your past.
Jane Wiedlin had a song in which one of the lines was "regrets only keep us where we used to be".
Put your regrets behind you and move forward
Bright Blessings