It is said that we put on a mask each time we walk out the front door. The face we know as our own, is way different than the one we show to the rest of the world. I would classify plastic surgery in the same category as weight loss. And it isn't far off from wearing make up or a certain type of clothes, to appear more professional, or gothic, or anything like that.
I think it will change you at least a little. More self confidence, self esteem, are just a few of the changes. If you make changes, most likely, they are in the direction of becoming the person you want to be. Meaning, that you will be different than who you are if these changes take place.