Christmas is a time to stop worrying about all the things that have gone wrong, and to remember and celebrate what has gone right! The time for analytics and other measuring devices should be delegated to the New Year, when there will be plenty of time to work out the good and bad things of the year past, and set up objectives to improve or rectify on the results.
But now it is the occasion to give thanks for the year, and celebrate the wonderful times you have had since the last Yuletide. Unless you have been unfortunate to have a truly awful time (which I very much doubt), there will be many things to remember, relish and recount. Look through your diary to remind yourself of past events (certainly as you get older, aide memoirs are vital for this), and compare how far you have come since last Christmas time.
Concentrate on all the successes you have achieved and the fantastic friends/acquaintances/contacts you have made. Look back at how you have developed, how much you have learned, and how much better you have become. Surround yourself with the glowing fact that you will have benefited from these experiences, and this can only be a good thing.
Now go forth with these positive feelings, aspirations and forward thinking, all of which are perfect building blocks for an absolutely fantastic New Year!