If you do not want to have a business supporting someone else's idea, you'll be able to come up with your own. But starting your own company is risky, though it offers rewards both monetary and private. After you start your own business, you're on your own. Much is unknown. You will never know for sure if your product will sell, if the customers will like it or will you have enough money to pay off the operating expenses.
The failure rate for brand new businesses is high. If your venture goes to beat the percentages, you alone can allow that to happen. To show your dream into reality, expect to figure long and hard hours with no assistance or expert training. If you venture out alone with little to no experience, the weight is placed against you. If this feels like too big of a challenge, the franchise route is also a better path.