I Want to Be An Actress

I just had a semi-fight with my mom. She was talking about my future. How I will live with them forever unless I do not get a new career where I can support myself. My parents do not believe that I will make it into acting. That it's a pipe dream that will never come true and to have something to fall back on. But I don't want to do that. You only live once and whatever job I do I need to enjoy it. I don't mind if I have to work whatever jobs until I get a part. Whether I need to do even two or three jobs. As long as I like them. I am just scared that my dream will never come true. It would be so easy for me if my parents believed in me. I don't want them to be right. I want to be happy and I know I won't in any other career.