Nowadays you make games using a game engine. Creating a game in them is easy but selling them or getting players is what is hard. As indie game developer you would have to know all of these things: creation of any kind of assets, designing the gameplay, coding it, and after youre done - promoting your game... Its still possible but will you succeed? The reason why I didnt start making my own game when I was 15 (Im 10 years older now) was because I was sure that i will fail. Now im finally makking my own game, but if i started 10 years ago, i would certainly be profiting on it right now