Welcome to OC.net, Samurai!
It's wonderful that you feel drawn to Orthodoxy... Don't hesitate to ask any questions you may have of any of us. We welcome them! I pray you find what you are looking for!
While I am a cradle Orthodox and thus can't relate to the issues regarding family personally, I have a friend who converted when she was a senior in high school, much to the dismay of her family. One thing she told me was that the most important and helpful thing she did for her relationship with her mother (who objected strenuously) was to talk to her about her decision and make sure she understood that the decision to become Orthodox was in no way a judgment of her mother's faith. When she depersonalized the argument, she said it made a big difference. I hope that helps. Otherwise, my advice would be to pray (you'll probably hear that a lot around here
). Pray for her to understand, and pray for the wisdom and discernment to say the truth in love, so that she understands how you feel, and understands that you still love her.
As to your age, well, I personally feel that the whole "you're too young" thing is a lot of schmiz. I have several friends who converted in highschool, and they are all still strong in the faith today! You are absolutely old enough to be making this decision, and further, kudos to you for recognizing your faith and acting on it!
As to the organ issue, I wouldn't worry too much about it yet. I have another friend who is in the process of converting even though he plays the organ at a Presbyterian church every Sunday. A priest will give you guidance on how to handle the situation.
That would be my other piece of (albeit unsolicited) advice. Seek out your nearest Orthodox Church and contact the priest. He will help answer your questions, and will guide your catechism (should you choose to pursue it). Also, begin to attend the services at the Church. It is very important not only to study the faith, but to experience it, in your catechism.
God bless you in your journey and welcome again to OC.net!