I'm a non-US citizen international worker in US. I work in a startup as a software engineer. Is there any reason I'm supposed to work more than my American cowo

I'm a non-US citizen international worker in US. I work in a startup as a software engineer. Is there any reason I'm supposed to work more than my American coworkers? We're paid the same money, in fact, I'm slightly underpaid. Or are you implying that internationals are usually more enthusiastic than Americans? That's at best [[citation needed]].