Then don't tell them. It is your choice, however since you are still at home you do have to respect your parents decisions because they only say it to protect you even if they say
"It is the Devils Work"
They are just saying it to protect you from harm, despite how ignorant they may be
Maybe prepare some information for them to show them what it really is rather than what they think it is.
I hope if you do tell them that it goes well.
As Ezanias said they would only want you to stop because they love you. But if you want to tell them and are old enought to make your own choices and honest judgements just be assertive and calm and tell them , show them you are ready to make choices for yourself and that magic is a beautiful thing.
The day you are ready to tell them is the day you will shed the fear of what they will think about it.
While I understand keeping it a secret may be eating you up a bit, I don't think you want to be harmed by the situation. So a stable ground and mind about your practice is probably your first step.
if you're under 18, they're legally responsible for you, so you need to tell them. don't jump up and announce it though, wait for the right moment. try to gather as much information as you can, such as books [better if your library carries them] links to websites, pamphlets, and try to type up information, highlighting the key points.
when you feel the time is right, ask your parents if they could sit down because you have something to tell them. ask them to listen before responding. sit them down and calmly explain your faith to them, it's morals, beliefs, the fact there's no devil, and why you have chosen the new path. show them the pages and books, and ask them to read them over. be calm, don't be demanding, and even if they say no, don't fly off the handle and start yelling with them. you'll have a greater chance of acceptance if you're calm.
if they do say no, you'll have to respect their wishes and stop studying magick. like i said, until you're of legal age, your parents are responsible, once you turn 18, or 21 or whatever age it is for you, then you can return. Paganism teaches that if the path is right for you, you will return to it. it may seem like a long time to wait now, but it really isn't. in the mean time, you could take up gardening, study herbs, cook, make candles, study mythology, history, genealogy, astrology, meditation, yoga, and a slew of things that won't seem to have a magical element.
