Welcome smiruk , dont jump in straight away trying to show your parents that you think the JW`s are wrong,they have been indoctrinated for more years than you have lived probably ,so dont think they are going to change by what you say.
They would more likely dob you in to the Elders for looking at apostate websites.
Take things slowly and gain more knowledge about the early history , teachings they once held to be true but dont believe now ,
Their is so much information on this site about all subjects just use the search option at the right hand top of the page and type in a subject eg: the origin of the name jehovah.
I wish you well buddy.