idk how much money a year can you make on server building and maintaining
I'm actually in the process of switching careers while finishing up college, the best advice I can give you is some of the best advice I've received, which comes from my father:
"If you love what you do, the money will follow".
Also, you're only fourteen. Absolutely concentrate on your studies, you can do other things on the side as a hobby but grades must come first. For all you know, in two, three, five years you may want nothing to do with computers!
Myself for example, when I was fifteen I wanted to do something with computers, unfortunately my school had an extremely weak computer program. When I came back to the United States I became interested in the medical field and wanted to go on to become a MD. Flash-forward three years and I want, with desperation, to get out of the medical field and return to the world of IT. But don't worry, these are totally normal emotions. I change what I want to do in the IT world just about every other week, I wish I was more definitive. I'm not too worried, I know it will all come in due time, and it will for you too. Good luck!