You haven't given us a lot to work with, such as how long it's been this way, or if it's always been like this.
I have a mid 2010 15" MBP and the trackpad is simply stellar. Basically a very simple component, their's not much to go wrong. Have you checked the settings for it?
If you bought Apple care, I would call them up and ask about it. Since I always buy the 3yr coverage, I cannot remember if the basic plan that comes with the computer covers you for more than 90 days of telephone coverage. If not, another option is to go to your local Apple store (make an appointment first) and have a genius look at it.
Good Luck...