I would have to know more about your job and the industry you are in, but more than likely you are entitled to overtime if you are only paid a salary of $450 per week. Feel free to call my office and I'll be happy to talk to you personally.
Under federal law there are a number of exemptions that could make you exempt from overtime. Like another responder said, more information about your particular job duties and responsibilities is needed to determine whether you are exempt or non exempt from overtime. The "white collar" exemptions typically carry a salary-basis requirement, that, in addition to meeting the duties test, calls for a guaranteed salary of not less than $455/week. If you potentially fall into one of these categories based on duties, then you would still be non exempt because your salary is not at least $455/week. That said, you should contact a local employment lawyer to discuss your particular situation.
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