I am sorry, but I cannot offer you much hope. Do you want to be in a relationship where your boyfriend is ashamed of you? Do you want to be with a man that lies to his parents because he doesn't want to find a different place to live? These are mayor red flags that it's not a good situation for you. If he loved you he should be willing to stand up to his parents and find a different place to live if he had to.
The only chance for you to be accepted by his parents is if you became a Jehovah's Witness. As you have seen, this religion is not what you thought it was. Trust your feelings on this, the Watchtower has lied about it's history and practices. Once you become a Jehovah's Witness you must do everything they tell you or risk being disfellowshipped and shunned by every other JW. If your boyfriend is a baptized Jehovah's Witness he can be disfellowshipped for having sex outside of marriage.
Your only chance would be if your boyfriend were to stand up to his parents and be open about you and his desire to be a Jehovah's Witness, but that doesn't seem likely. Even if he did, he might decide to go back to being a Jehovah's Witness, including four hours of meetings each week, door to door work every Saturday, no Christmas, no birthdays, no Easter, etc. Is that what you want in your life? Is that what you want for your children, if you had them? Do you want your future children to be told they will die a horrible death at Armageddon if they aren't good?
You seem like a nice person, so why would you accept being treated like this?