I think you should determine if you want facial hair. If you do not, shave it. Work out if you want to be cleanly shaven, or it you want to stylise your facial hair, and then take the action you decide. Although you may want to wait for a guys opinion on this. ^^
Nothing wrong with shaving now. As soon as you start though, it grows a lot quicker! Depends too if you actually want facial hair. At 16, it might look mature but in a couple of years it becomes such a pain, and looks a bit trampy sometimes.