4. Game Development
If you are familiar with software development, game development would be a breeze for you and the fact that it will work and bring you a good amount of money is guaranteed because people are really invested online and in the games. However, you would have to undertake all the responsibilities and do the programming, art, design, testing and more, because having the money to hire programmers, designers and more would need major financial support and considering your tender age, it is safe to assume that you would not have it.