@Sushant bro, looks like you are already on the way. I suggest to come prepared to face the reality, as others mentioned. Come prepared for the worst cases. It's not always the place that is bad, different people come with different background hence different struggles. Schools here are definitely worth a try if you are really into studies and not just excited because of what you see in Facebook, Hollywood impressions etc.

Come here. Study hard. Work hard. Chill. Be independent; whatever that means. If you stay in Nepal for 4-6 years at your age, someone mentioned undergrad, you will get sucked forever. The age you are on right now is the defining age for what next in your career. If you spend next 4-6 years in Nepal you might not even want to come here after-all. Undergrad time sets a different kind of attachment to the place / people you live on/with. There is always option to go back to Nepal but most do not go that path which I never understood why, dumbfuck is exception, and I hope to meet him when I get back in few years.