<< "It's too powerful and doesnt have any respect towards other countries." >>
[sarcasm]As evidenced by the astronomical amount of foreign aid the US issues each year.[/sarcasm] The Marshall Plan, disaster relief, foreign loans, free trade agreements, the Mexican bailout, etc... Much of American foreign policy is geared towards issues that also affect us, but the US recognizes and respects that what affects other nations also affects us.
<< "They think USA is 90% of the world." >>
See above. That is just an assinine statement with no basis in fact.
<< "What good has ever come out of USA?" >>
Television, the Internet, modern computing technology...
The space shuttles, the begining of Space Station Alpha, culture (Music, movies, television, food, clothes, etc.), the idea that everyone is equal and everyone has the opportunity to better himself, the most liberal immigration policies in the world, NATO, ANZUS, the OAS, free trade with Canada and Mexico, CNN, Boeing, American Football, The Gulf War, "Swift" ends to WWI and WWII, a counter-influence to communism, The League of Nations, The United Nations, "Democracy" as much of the world now enjoys...
The US can't take full credit for most of that list, but without our influence, most of those ideas/innovations would have taken far longer to develop. Tell your friends to grow up.