I agree with the other answers, i.e., that it's not really anything to worry about. Take the number with a grain of salt -- yours isn't any more padded than anyone else's. It's my understanding that the software racks up another contribution every time you 'save' your editing work, whether that work is adding a whole eloquent biography or just adding a comma. So if you don't want a big count, just don't save often! But we've seen occasional problems of members somehow being logged out of the site while they're in the middle of something, and losing their work because of it. That has gotten some of us into the habit of trying to save more frequently. So, just play with it a while and adjust things to your liking.
I think the direct answer to the question is no, there isn't any way for you to remove contributions already counted.