I'm an h2b visa holder. I already have my w2 form. I know I have to go to a place where they can process my tax like h



Should we h2b visa holder should pay taxes and contribute to the social security? How can we get it back?

H2B visa is for temporary/seasonal, non-agricultural employment in the USA by foreign nationals.
But still you will pay FICA taxes and all other taxes just like a U.S. citizen or resident. When did you enter the U.S. or H2-B visa? Are you married? These questions are need to tell how you will file your tax return.
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Agreed.