Welcome Maz You said you live in another part of Asia Wouldn't happen to be China by any chance?
Anyway as others will tell you Your not dealing with a rational mindset. So keep this in mind when responding to your mother. Turn the guilt trip around so she feels responsible for stumbling you. Like Mum I'd really like to believe that Jehovah's people are the happiest and most loving people in the world but I don't feel the love when you call me a murderer. Give her hope that you may return if only she treated you better.
Never attack her beliefs this is her security. Work within the frame of her mindset be creative Like Mum doesn't the bible say whom Jehovah loves he disciplines that I like the prodigal son may need to learn from experience how bad the world is before I return If she is anxious about how long it will take tell her not to worry to trust in Jehovah and pray that it will not be long
Get the picture