Alrighty, lemme tell you a story. So I'm pagan and stuff. My gods are Shiva and Anubis, I do tarot n stuff along with alchemy, crystals, magic circles, empathy, all that good stuff.
Most of all, I am a very strong medium. Quite difficult to hide, actually. Something I can't really escape.
About family issues, both of my parents are very active members of the Catholic church and as you know the Catholic reputation, the pagan topic is quite a sensitive and dangerous subject. My whole life I've had to live in both visible and invisible worlds on my own (especially in catholic school) and believe me, keeping such a secret was absolutely crippling. Kind of a bad idea to open myself up on a website but either way I feel like I must share. It was not only this that I was hiding from my parents but also the fact that I was pansexual. It was quite the triple threat I was dealing with.
Heavy secrets such as beliefs and identities can be unhealthy when they are kept for a very long time - especially away from your parents who, as good parents should be, a very important element in you life. Holding secrets can destroy you mentally... In my experience.
If your parents love you, support your choices in school and career, I'm pretty sure they will still love you when you tell them the truth about your beliefs - especially if they are aware that you are making yourself naked to them, if you know what I mean. It took a while for them to adjust to my chosen lifestyle. Yes your parents will probably be upset at first and maybe blame it on themselves for your choice and that will probably be the hardest part of it. If they're your parents and they do love you, they will learn to accept what you chose and maybe even begin to feel a closer bond to you, after seeing how vulnerable you made yourself be in front of them. With my parents both being music ministers in different churches, confessing my choice of religious life was probably the most pants-wetting thing I have ever done... But once it was done and I saw that my parents loved me anyway, the greatest weight was lifted off of me. I suggest you go and try to confront your parents. Even though they may get a negative reaction at first, that doesn't always mean it will remain that way.
Anyway I don't know your family life and I'm just speaking from my experience so I might either be helping you or not but I do hope you find this helpful. c: