Whether you believe it nor not many of us are. Therefore they will continue to going whether people believe in them or not. Having the belief in ourselves is what is most important.
If your focused on I wonder what my family will think if I work to startup a business and or do something nobody in my family has done. Thinking along those terms can be very bad over the long haul.
For one you will continually question yourself as if will you win the approval of your family and etc. Instead of getting approval focus more on the support. The approval that you should only worry about is yours.
If you are not crazy enough to believe in yourself then there is someone else who will believe in themselves, and achieve what they are striving for.