There will always be doubters. You could look back in time and see endless stories with people not believing in something that happened. Become a leader and help others to become one as well. Your actions and your thinking will become the norm and people will not think twice. It will become the way of society. Start by having an impact on the people around you. Invest your time in making yourself and others around you better. Do not get stuck watching. Help others around you improve and grow. The better they are, the higher your ceiling for potential. Just remember that we compete against a nameless, faceless opponent. The only real competition is yourself!