Stop listening to people who tell you to be realistic. Being realistic is just a slow road to being average, and you were born for greatness. Everything around you was built by people no smarter than you who were simply crazy enough to think they could change the world. Look at Steve Jobs and Steve Wozniak. They started with zero dollars in a garage. Jobs had to sell his van just to get parts for their first computer. He ignored everyone who said it was impossible and built an empire. You have that same power inside of you right now, but you have to stop letting the opinions of others drown out your own inner voice.