I am an italian boy and I want to study english to discover the world. ;-)

Italian boy wants to study English and discover the world.

Hi! I'mItalian and I want to study English because I like travel and would like to move  to the United States and perhaps stay there forever.

I am an Italian boy and I wants to study English to and discover the world. ;-) [The way you write sounds like a personal ad. I prefer the title be, "Italian studying English to discover the world."

Hi! I'm an Italian boy and I want to study English because I like travel and would like to move in to the United States and maybe perhaps stay there forever.

Not sure if you did not know the rule that 'I' must be capitalized when referring yourself and what are proper nouns.  All proper nouns must be capitalized in English.