Use your time wisely and plan to go to a college or university if you can while living at home to get your feet prepared for the real life outside the Organization.
You can't convince anyone about your research no matter how many facts you show them, the mind is a powerful thing and your Mom invested time/years in the WT and just by her comments gives you a clear clue she won't doubt this org. This organization teaches that if you have "doubts" you are weak and allowing room for "Satan".
It's a great thing you discovered this at a young age because you won't waste years in the WT since they don't like higher education, but rather earn yourself a good education, good job and great future. Just think by 22-23 you would be able to finish a career and find a good job, those are years you won't get back if you spend them like this Org wants you too... What age did you get baptized?