The antonyms for the phrase "am same class as" would be "am not same class as" or "am in a different class than." These phrases denote a difference in social or hierarchical status, academic level, or financial standing. In a school setting, students may be placed in different classes based on their academic abilities, with some in advanced courses and others in standard or remedial classes.
In a business or work environment, employees may be in different classes based on their job titles, salaries, or seniority. Likewise, in society, people may be in different classes based on their income, education, or social standing.
It is important to remember that one's class does not define their worth or value as a person, and we should strive to treat others with kindness and respect, regardless of their class or status.