Hey there MsBucket, personally I think that as easy as it is to do it, that it's a mistake to use this board or any other on-line forum to fill such big social voids in your life. I have to stop myself from falling into that trap myself, so I'm probably not one to preach!
The thing is that you speak of yourself as being rather introverted, but perhaps that has been as a result of circumstance more than personal choice and personality type. Clearly you've had severey reduced opportunities to engage in the real world being a mum and a jw for many years.
My only adivce is to take up every opportunity that comes your way, even if the last thing you feel like doing is leaving the house. Perhaps you might not feel like you're the best of company, but I can guarantee you that you will always feel better when you come home for having gotten yourself out and about. I believe that hybernating and shutting yourself off from the world is terribly unnatural, and unhealty for you. You owe it to yourself to do your best to build new networks and start finding yourself and who you really are for the first time.
Perhaps try making a mental list of those things you can do. Like joining a cycling club, doing some voluntary work, starting a new career, definitely consider going back to study at uni or doing some college courses. Don't force yourself to be involved in things you don't enjoy just because certain types of hobbies suit other people. I'd definitely consider doing some group travel, plenty of people travel alone and it's not nearly as scary as you think. Take up meditation classes, or whatever it is that floats your boat. Start dating again, if you're not already happily hitched, and have some real fun. Only you can maximise the quality of your life. It's easy for us to sit back and say that life's dealt us a pretty rough hand, but you're plenty young enough to build on what you've got:)
If all that fails prod your daughters to spit you out some grankiddies to look after;))
luv frog x