Renting a place for $450 is possible on your budget, I did it for a year on less (my car was already paid for). I lived off of a $12K stipend my first year of med school. My utilities were included in the $450 which was nice and I lived by myself. Parking stunk but i got over it. The hardest part is being able to budget as someone said earlier. I really had to ask myself with every purchase, DO I really need this?
If you can't cook, learn how to make some cheap casseroles, soups and how to grill decently. Casseroles last for at least 4 days. Cereal is cheap and is not just a breakfast food and peanut butter is a good source of protein.
Living close to work will save a ton of money on gas which has become a huge problem.
If you smoke, stop. Save yourself $60 a month. If you drink, well, either quit or acquire a taste for Pabst. (i really have no idea what the cheapest beer was, just remember my dad used to drink that stuff because it was cheap)
Most importanly, stay away from credit cards! sure you need one for an emergency but make sure it is an emergency. When you don't pay cash for something, you don't appreciate how much it costs until you have to pay the bill at the end of the month.