Is US government really merciless on its own people?

I heard that US government is terrible and it does not support or give any help to its own people and society. And it is just like a company. All my life I worked with americans online, I have learned American English, I even applied for a greencard, we always watched Hollywood movies and shows and we even played video games based on American cities and characters. But now I am so afraid to live in the US.

Even though my country is a 3rd world country which has a high inflation, our government and families always support us in the hardest situations.

Is US government really merciless on its own people?
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