So you are the bad girl in the opinion of your parents?
Money is good to have but it's not everything in life. I know people which have money but are not happy with their lifes people who just worked the whole life to get rich and turn ill to just die doing nothing than work all the time. As long as you have a place to stay, food, friends and are healty you are rich but it's for sure that you need at least some money for it.
I just think your parents are proud of what they reached and they surly did it also for you and your brother to give you a better life. That's why they want you to keep on going with that buisiness. It's not easy to explain them that you want to try the same they did to build up some buisiness for you and maybe your future family on your own. Try to tell them never stop following your dreams.