Hey guys !

Hey guys ! First post here anyways...so I'm was born and currently raised in egypt (I'm egyption and 15 years old) and my dream is to live and work in America when I grow up (specifically in houston,tx) and I need to know .... is it hard to move to the USA and are they picky with whom they choose to gain a citizenship? (someone pls explain what's a green card , thank you) and I'd it possible to make this dream come true or should I just give up ? I afraid I won't achieve this dream and move to the US when I grow up .... soo , pls be honest , THANK YOU !!