Dear anonymous17
I can empathize with your situation. It is not easy at all.
You seem to be a very loving and kind person. And you know that your parents react like this because they want you to be saved. They are indoctrinated in this belief.
My mother is acting similarly, even though i am older than you (35). She writes me letters, that she is sad because I distanced myself from "jehovahs organisation." I let her know in a always very loving way, how I appreciate her and also her concern. I tell her the reasons why i left the organisation, but that my relationship to god is much stronger now. I tell her she don't need to be sad, because my personal hope and fate rests wirh god, no human or human organisation can decide or judge me. I tell her the things i believe in (unconditional ove respect, pacifism, human rights). I tell her that i will always be there for her and love her.
I tell you, just act according to your conscience. If you feel that your conscience can't support some watchtower teachings then decide for yourself that you can't follow those. Research about it. To decide what you believe or not is a long journey, sonetimes a lifelong quest. You might change your views and beliefs several times, thats nothing bad. And you will never get all the answers.
Maybe let your parents know that you want to follow your conscience. Tell them that you love them AND THAT YOU RESPECT THEIR VIEWS, BUT THAT YOU WOULD LIKE THEM TO ALSO RESPECT YOUR FREEDOM TO DECIDE ABOUT RELIGIOUS MATTERS ACCORDING TO YOUR CONSCIENCE.
Don't follow them for hours just being like a robot. This wouldnt be good for you.
Anyway i wish you all the best