While you may complain, your supervisor is most likely not required to do anything to help you. Workplace bullying is common and completely legal. Unfortunately, your fellow interns and even your superiors may bully and harass you. However, if the bullying or harassment is directed against a protected class of people, then the bullying may qualify as unlawful discrimination. For example, if your coworkers are excluding you specifically due because of your race, disability, or sexual orientation, you are most likely suffering from harassment, not mere bullying.