Hold on. How long did you date before you got married? In my opinion unless you have lived with someone for at least a year or two to see how they interact on a daily basis, you aren't ready to marry them. Also, some girls hide their true selves UNTIL they are married.
In my family each father for a few generations has said one thing to each son regarding marraige, "Look at the woman's mother carefully before you marry her." Now you would wonder how this advice gets passed down repeatedly, but it's because everyone is so certain and thinks "It won't happen to me." I've heard this information passed down for enough generations at this point that I will follow it for sure. Once a woman is married they resort to their true selves... most often very similar to their mother.
Anyway, I got away from the point of this post. If you feel this way after so short a period of time, you better get out now. No reason to subject yourself to further misery. I know it sucks, I feel for you man, but next time you'll have to make a better decision (and meet the girls mom and analyze her closely!).
EDIT: I agree with the above poster we need a little more info here. But my overall sense was that you don't feel right with your marraige. After so short a period of time it should not be like that. Marraiges tend to detiorate after a few years, not within months.