I agree with what dhonour has to say here. If I would have gotten involved in druidry at 19 when I still lived with my parents, life would have been difficult and it would have been hard to hide. Not only by receiving the course materials. ( No internet back then ) so the OBOD way would have been the only way, and then they would be the problem of finding " alone " time to study. The rituals would have to be done alone, away from home. Myrde. I feel for you. Sometimes choices are not easy. Even though my druidry is Christian based my parents would have found it unacceptable back then. My dad is not nuts about it now, though I have explained it to him and he is much more open about things now than he was in my younger days. Both he and mom are in some ways nervous of it. My sister is very accepting of it and would make a good druid herself. Now if I went pagan, OMG!! My parents would flip!I wonder if the people saying that you should simply 'come out' about your interest in paganism / Druidry haven't lived with deeply religious parents. From my own personal experience I would recommend keeping it quiet until you are not dependent for anything anymore: and I would say that it's OK to keep your spiritual beliefs private if that's what you need or want to.
Basically don't feel pressured by anyone to do anything: follow your own path.
I would try to keep it quiet as long as I was at home. Getting kicked out before you are ready is NOT a good thing. Be a " stealth " druid and prepare a way to move out. Prepare for the future. But be yourself.