I want to get serious with my talents but how?

Hello. I know i am good with drawing (i aim to be davinci.........) and i am also good at music and i want to get serious already not just lame doodling at the back of ur notebook. i want to be like einstein davince beethoven i want to be known to the whole world. But i think when i die that is the only time my works will be noticed and that is particularly VERY boring. I am such a bum! i want to have a course in fine arts but how the hell would i get a job? I dont know how to start being serious in making drawings. and painting and my parents cant afford drawing lessons. i am 14.