Hi alpha, I am too from Australia, where abouts are you from? My heart goes out to you in this situation, the exact same situation I went through a year ago, this was probably the biggest thing that has ever happened to me and I still find it hard to get through the shock and rage when I really found out the "truth". I found reading alot of books on the healing process after you come out from a cult really helps, because when you are first doubting the org, you are still wary of so called "apostate" books, after being indocrinated all your life as too how these books will lie to you. There are several books on cults, and they are unbiased, you will find some links if you do a search on "Cults" on this site.
I was never baptised either, and count yourself VERY lucky that you were not. You can fade away gradually without being shunned by your family. If I could do it all again, I would have done this, instead of denouncing the org with anger like I did. Now my family are very wary of talking about anything Wt related, and I am starting to wonder whether I will be shunned anyway.
Sounds like you've got it tough at home, this though I was kind of impressed with:
They continually pushed me to do better in school and be really smart
I wished my parents encouraged my studies, you are very lucky, this is rare from JW's. I was discouraged to go to uni and lucky to even be allowed to finish high school, even though I was smart, now I wish I had of gone to uni and i'd have my degree by now. Now I have to start all over.
The best advise I can offer is what everyone else has already said: Take it slow. You can get through this.