Problem with most of us is we  dream too much (including me) thanks god I realized that in very early stage. Now I know how to keep ambition not too high. Judge your capacity and lower down your ambition. Most important thing in life is happiness, if your ambition  comes between you and your happiness that is bad ambition.
Sunsweesh bro chill down and complete your education this is your acid test. There are problems because there are solutions. Once you complete your study then go back to Nepal and start a business or teaching in some remote village (this will not be easy too) and live comparatively happy.

There are people who have bigger problems than you but they haven't given up, you have to fight like a knight (but not with weed, drink and drugs they are the source of depression).

I don't remember who but someone said this
Success is not the final, failure is not the final it is the desire to continue that takes you to final.
TMS