To move or not to move?

i live in australia, nsw and really want to move over to england, allot of my friends are already there or are going to move so i would have people i knew there. but i dont want to leave my family, im one of five kids and i would miss my siblings and parents so much, i also feel like i would be letting down my family as i take care of my younger siblings occassionky and we have a very strong family system, they would never tell me if i was letting them down but i dont want to hurt them! i dont know what to do please help!