Welcome to the board - Sorry you are having a rough time.
I'm assuming you are male.
1) Do not get married if you are not in a position to support your family. Do you have any idea the stress in a marriage when there is not money to meet basic necessities? How bout adding a child to the equation of no money? You owe it to yourself and your fiance to be able to support your family.
2) Run, don't walk, to your nearest community college and sign up for classes. It sounds like you have interest in something medical, and there is always something available in the medical field.
3) Go apply for a job..any job..get out and meet people. There are countless jobs out there that are available to anyone. Anyone can make hamburgers or bag groceries. There is no job that is beneath you. You have a responsibility to take care of yourself. There is nothing wrong with being afraid as long as your fear does not stop you from doing what you must do. You have been out of the real world by being at Bethel. I would imagine it is a shocker to be kicked to the curb without so much as a thank you for all of the personal sacrifices that you have made to volunteer there. Stop isolating yourself to the congregation. They are not going to help you pay your rent or feed yourself.
4) Go to a doctor and talk to them about anti-depressants. It is no wonder that you are depressed after your experience. Counseling is not a bad idea either.
Your post strongly suggests that you are at war with yourself. You have seen the inner workings, and you are seem dismayed at what you have seen, and it is no wonder. It is a shock to see the reality up close when you have been taught the fantasy all of your life. It causes no small amount of mental distress to have those contrasts thrown in your face like you have had by working at Bethel. At the same time, you still want to believe that the world of the witnesses is as perfect as you have always been taught. The truth about what it all really is is very hard to reconcile with what you always thought it was supposed to be. I am sorry for your experiences, but I hope that you use it as a wake up call to do something with your life and not count on God to destroy the world soon to solve all of your problems. God helps those who help themselves. The best place to find a helping hand is at the end of your own arm. Best wishes to you, and I hope that your life gets better.
Caligirl