If you are tired of it I think you should cut it, but go slowly as the person said. I think it is a shame when women are stuck in a hair rut. There is wiggle room in just about any person's head of hair for a change, even as you take into consideration what looks good with your face. You don't have to go short short, just an inch or two. It will grow right back if you don't like it. Life is too long to have one haircut for the rest of your life!
I know women who have looked the same for 15 years. Usually it is very very long and they have come to equate their hair with their identity.
If you feel like an updated do, I say do it!
Jen