Polish loans? Hahahahahahaa....HAHAHAHAHAHA.
No, sorry, HAHAHAHAHAHAHAHAHAHAHA.
Sorry, but if you're Polish - then you should know what's available - exactly nothing. There are loans available for studying within Poland, but these are never going to be available to study abroad.
However, American universities do boast wonderful scholarship programmes - I suggest you contact individual institutions and see what's on offer. For instance, any Ivy League university will offer truly amazing packages - if you're good enough.