Parents don't want me to leave them to pursue job

19 M, currently pursuing graduation in a metro city, my parents don't want me to leave my hometown and then to pursue career in a metro city after graduation. They instead want me to come back to my hometown and start some local business. And the reason for this is that my mom thinks that I should be there to take care of her as she ages and i wouldn't be able to do that if I get a job far away, and my father thinks that I should be here to spend time with him and that he doesn't feel good without me here and he needs my support and time. This is the only thing that's being talked about at my home lately. I wanna somehow, anyhow persuade them to let me go since that is what I want. And my reason to leave my hometown and opt for job is because I've been sheltered my whole life and I want a life of my own and I'm quite an ambitious person and I don't know what I'll do once my ambitions are taken away from me. What can I do?