I am so sorry your grandmothers are so deluded that they can ignore their natural feelings of affection for their beloved granddaughter. You are a sweet girl, I know this or else you wouldn't give a damn what those two old ladies say and think about you.
I was raised from infancy as a JW. My mom didn't approve of young people getting baptised too young, so I was 17 when I got dunked.
I only had one question before I got baptised. It was "how could a religion that is only 100 years old (it was 1971 at the time), be the only true religion. I asked the pioneer sister who I trusted the most, how did JW's get started. She said they started as a small group of Bible students who got together and studied the Bible and discovered that none of the churches were really teaching the Bible. She said nothing more, nothing less.
Well, I trusted and respected her and got baptised. Three years ago, in 2010, a full 39 years later, I found out I was outright decieved and lied to. I was furious! If you have to lie to people to get them to join your religion then what does that say about you? When you tell people they cannot look at any information that is derogatory about your religion, what does that say about you? When you know that if you leave the religion, no one will talk to you or help you, it is emotional blackmail.
That about sums up how honorable Jehovah's visible earthly organisation is.