Employers are not required to treat all employees the same, unless the reason for the different treatment is discrimination against one of a small number of specifically protected categories, such as a person's race, religion, age over 40, disability (which generally means treating the disabled differently than the non-disabled--and not allowing one disabled person overtime, but not another), or sex/gender. Also, while employers must pay overtime to nonexempt employees when they work overtime, the employer is generally free to schedule overtime or not, and is not required to make overtime available to all employees.Therefore, from what you write, unless you feel you are being treated differently or worse due to you race, religion, age over 40, etc., it is most likely that the employer does not have to give you the opportunity for overtime. It's not the employer's responsibility to give all its employees the chance to make extra money, unfortunately.