Is your family paying for your college? Your room? Consider your mike work to be a true job, and you are using your family for tuition, room, & board for 4 years. Once you are able to truly support yourself, then get out of all of this in one fell swoop.
You should strategically plan your exit. If you financially rely on your family, go see a guidance counselor. Tell the person exactly that you are a JW, you want out, your family will shun you, and you need real help funding college & living expenses. You don't want loans. You want grants. You want a job. You want a free/reduced price housing. As much help as you can get. It is my understanding that there is scholarships available for JWs, ex-cult members, etc. Your guidance counselor will probably jump barrels to help you. Even still, losing one's family whie in college would be a big, traumatic emotional wreck to have to get through. Do you want to insert this type of emotional distress into your life right now? Would your family disowning you (possibly derailing your studies) be a wise move at this time in your life?
If not, bide your time with mike work. You can probably get away with not doing one speech here or there. Perhaps you have a sore throat or an ear ache coming on. But, other than that, I'd put up with it for 4 years, get your degree, thank your parents, and find a job on the other side of the country.
I went to college full time, held down a 30 hour/week job throughout. Made Honor Roll most quarters. You can do this. It will prepare you for a time when you have to balance much more on your plate.
Update us, ok?