My Dad was not religious at all, my Mom was a witness (although she was a person everyone loved). I also got kicked out of my home when I was 18 -- by my father.
The difference was my Dad had been in the military, very involved in voting and being a patriot.
His first-born son - me - studied with the JW's, was baptized, signed up as a "conscientious objector" during the Veitnam War, pre-1975. Then, instead of going to college (he had worked hard & saved the money for me) I started full time pioneering and took a stupid part time job. When he could not take the embarrassment, shame and anger anymore (6 months)...that his son was not following his footsteps & good advice...he said, "My way or the highway..."
I spent the next 3.5 years as a regular pioneer wasting my life.
What's happening with you Richie is a similiar thing. Your Mom is suffering "embarrassment, shame and anger", too. I hope you do not take any drastic action with your Mom as some have suggested. Allow her her anger, no matter that she's wrong. Let her have the chance to see your best side, contrasted with her own fury. My Dad even refused entry in his house, nor would he speak to me (yep, shunning ) for about a year, before he finally saw he could not force me to aquiese to his demands. I was then treated with at least a measure of respect for standing up to him.
A lot of what's happening IS unique to the JW way of life, but, a great deal is just parents and their off-spring not seeing eye-to-eye.
Your Mom has been thru a shock, too. But, you being the better person here and trying to preserve your family ties, will make you a better man. Hopefully, she will see that. If not, you will enjoy a clear conscience knowing you did your best.
Good Luck,
Rabbit