My advice is:

Please go to 4 year college in Nepal for your undergraduate studies. In the mean time keep reading GRE (it is little bit harder at the first time) if you want  to go to USA for studies.Take GRE, and TOEFL in your final year there and start applying for Masters or Ph.D program in USA. The universities in USA have Teching or research assistant positions for graduate students. After 4 year of hard work you can get a degree and hopefully a good job in early age. But, if you go right now, life is very difficult and who knows, you may not be able to complete studies forever. 

Hope it helps.