Daunt,
You did the smart thing in avoiding baptism, you may be able to retain some relationship with your family who might otherwise shun you had you been baptised.
You've noticed an overwhelming theme in the advise given...make damn sure you get your ass in school and earn your degree, and I will echo that, because it's the most important thing you can do right now.
Take it from someone who's not a whole lot older than you and still wishes he concentrated more on college. Make college priority number ONE. There will be time for fun, girls, and parties along the way. Keep college as your focus, and you'll be glad you did.
Metatron gave good advise as far as the family thing goes. For the sake of your relationship with them, you may have to throw them a JW bone now and again. If they're happy thinking you may come back to the JW fold, let them go on thinking that. If they ask if you've been to meetings and such, tell them what they want to hear. I feel no guilt in lying to people that were intent on having me waste my life for their lies....other people may feel differently, I'm sure.
Do well for yourself. On some level, certain JW parents still feel pride when their kids do well in life, even if those kids are not JWs.