Relationships are hard, especially when family don't agree with it
Can you talk to your family about why they are concerned? Explain his aims and that he plans to work and provide? I can understand your parents concerns - they are just looking out for you and want the best for you. If possible I would sit down and explain that you do like him and that he has plans. Allow them to talk about their concerns and ask questions. It might just be them needing time to get to know him