Dear scared, your situation sucks. But it's not unique and not unique to JWs. Its a child growing into her own identity and her parents wanting her to clone their identity. Happens all over the world in every culture and religion.
JWs do make it harder with their bizarre 'cut you off' cult rules. believe me, when my parents cut me off ( dif situation to yours, I was 29, married, in bethel bla bla bla) it def hurt them more than me.
Without crumbling to their emotional pressure always remember they truly believe satan is attacking their daughter, it's truly heartbreaking for them and out of JW engendered fear they are acting this way. Treat them with compassion and love. It's def worse for them than you, because deep down they know the disfellowshipping law is Anti love.
Be thankful for their love, for whatever the JWs gave you and tell them that... With maybe a back up in telling them what your learning. Remember everyone is entitled to their own reality no matter how different from yours.
Getting out From JW propaganda is only the first step in truth seeking. Wait till you discover 'the matrix' for real. That EVERYTHING you see on TV and in newspapers is a lie manufactured to control you, just on a grander scale than the little JWs.
Perhaps watch some David Icke, Gregg Braddon and Bruce Lipton on YouTube.
Look up crop circles, UFO citings, Illuminati, the truth about the ponzi banking system, 911 set up, FEMA camps, the fact the US has more inmates than ANY nation in history EVER!! princess Diana's death, US warmongering and cruel colonialisation of so many countries right now, (US has 40 military bases surrounding Iran, Iran has 0 outside it's own country), US spends more on military than every other country in the whole world put together!! The 6 million Jews death myth... Did you know Red Cross recorded a growth of jew population a few hundred thousand over the nazi war years!! Chem trails, Monsanto with its GMO poison, vaccinations that cause 1 in 50 children to become autistic, the big pharma conspiracy to keep us sick and paying for drugs. Watch 'forbidden cures' and know there are many cures for cancer, all outlawed. I live next to a successful cancer clinic in Peru. People come with only months left and leave in a few weeks with no sign of cancer, this is outlawed in western countries because cancer is a one trillion dollar business.
The list is endless. Don't feel bad that you were fed lies by the JWs, we've all been fed lies by authorities our whole lives. Follow your own path, find the truth that feels right to you and makes you happy. Control always comes from peers, that's how minor amounts of people keep authority over masses, through use of their peers and fear of disappointing them.
love your parents, love all the JWs and know that Jesus teachings of love even for your enemy... That's the only way our world is ever going to heal. Love and compassion... And fading out slowly will be less painful for everyone involved:)
blessings on your life's journey darling girl, it will be as beautiful and magical as you want it to be. Xxxxxxx