YOU are too generous. Be proud of yourself. NOt everybody has a big heart like yours. Life is all about karma. 

Most of the nepalese  have same problem as you have. I too quitted my study and went to aboard to earn money with a hope of helpin my parents. I am still helping them but my brothers and sisters didn't study.  I  always tell my parents how much I earn and how much I can send them.

 It's been 12 years living aboard alone.I am turning 30ish.I don't have any saving and career till today. Now, I am pursuing college study.But I am happy. :)