Thinking about getting the green card

I am dreaming of getting the green card one day. This country will limited me a lot in improvement because of my indentity. There are three ways to get the green card. One is chosen by most of international students. They will choose to get hired by a company. Then the company will apply for green card for them. The second way is by marriage. The third way is through investment. And the last way is through political asylum. Of course for me, I will choose the first way if nothing surprising happened. But only the best students can be hired by companies in U.S. Because those companies are required to hire american students first then international students. And they have to provo to immigration bureau that this postion can't be qualified by U.S citizens. They also have to pay $5000 to apply H1B visas for those international students. And things are not over after you get the H1B visa, you have to apply for green card with 20% possibility. So it is really hard for international students to stay in U.S.