Can i return a brand new car?

i bought a brand new nissan altima 2010, on november 30th. I traded in my 2007 toyota corolla. my payments are now 459 per month for the new car, I was paying 294 for my toyota. my total came up to 31,000 something, and i have a 1.9% interest rate on the new car. I want to return the car because i don't believe i can afford the payments. i ran into some financial problems when i left the car lot. I spoke with the manager at nissan bout returning the vehicle and he said it gonna cost me to return this car, is this true if not what els can I do.
 
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