I don't think it's ungracious to seek cosmetic help - it has crossed my mind from time to time, and I have been tempted. But it's too short-term. Once you start down that road, you have to keep going.
I don't pretend to be happy all the time. I think to be human is to be happy and unhappy by turns. But I have a great capacity to enjoy myself, and it seems to grow as I get older.