tl;dr - I fancy going to AmericaWatch
otherwise I'm hopefully going to take a year abroad as part of my degree to study somewhere in America, haven't decided yet whether that'll be in NA or somewhere like Brazil where I've always wanted to go too...
not that I have any experience with this yet but I've heard it's notoriously difficult to get a visa if it's not part of an exchange programme (like the two aforementioned items above) so I'd say your best bet would be to travel as part of your uni degree. also America is quite a long way to go if you've never travelled before haha maybe start by going somewhere in Europe? just to get used to the whole experience, I can't imagine your first ever time going abroad and entering an airport including all of the extra customs and security checks, only to board a long-haul flight afterwards! that sounds hellish ngl