I'm assuming your friends are fairly close to your age. Anything you do that is even semi drastic in appearance will be rewarded with them busting your chops until the new wears off, or until someone else in the group does something to draw attention away.
I had a similar reaction in 1981 when I got my ear pierced (seems very trivial by todays standards)
If your mind is set on shaving 100% then go for it, your friends will get over it if they are indeed friends. If YOU change your mind, it will grow back. Don't let them drag you down.