I want to earn cash on the internet

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I got bored of all those sites who say they pay you if you read emails or complete surveys. I want something new, for example a job on the internet where i can do something, write an article or work at a document. I like to do this kind of stuff, because everybody says i am good at everything. I am a 17 year old pupil and i live in romania. Does anybody know an international job i can work on the net? I like very much maths, physics and informatics too. Help me please!