I am a worker at a company. I signed a contract with the company. In this contract I accepted that work 8 hours a week without any insurance and other favorities. Furthermore, my payment is less than other workers who works like me. Regarding the contract and my sign, is it possible to sue an action?

I am a worker at a company. I signed a contract with the company. In this contract I accepted that work 8 hours a week without any insurance and other favorities. Furthermore, my payment is less than other workers who works like me. Regarding the contract and my sign, is it possible to sue an action?