Afraid of being myself?

I've always wanted to design fashion, but have never done so because I know my family will think it's silly and make fun of my endeavors. I told myself that once I moved out of my parents' house that I would start following this interest, but I won't be moving out for another year or two. How do I get past the fact that my family will make fun of my efforts even though it's something I really want to do? This is really holding me back from making myself happy. How do I get past it?