The Scot lost to Roger Federer in the semi-final of the Barclays ATP World Tour Finals, but immediately vowed to work hard at his training camp in Miami next month to get off to a flying start at the Australian Open in January.
Murray won three tournaments in 2012, but two of them were the Olympic Games and the US Open, giving him his Major breakthrough.
"If you told me last year I'd be sitting in this position with the results I had last year, I would have signed up for that straight away," said the 25-year-old.
"I'm happy with the year and I'll work really hard in December to get better."
Murray will miss the BBC Sports Personality of the Year ceremony on December 16 to concentrate on training. He explained: "That period of the year for me is so, so important. For all of the players, it is the same because we don't have breaks in the year like other sports for two or three months at a time. Now I will have a week off to rest and go on holiday and then start training again."
Murray, of course, is one of the contenders for the BBC award after a great British summer of sport, but admitted there was no shortage of outstanding candidates.
"Who knows what will happen on the night? I don't know who would be expecting to win it.
"Chris Hoy became our most successful Olympian, Bradley Wiggins, what he did, the Tour de France is one of the hardest physical sports by far. Then all the medalists at the Olympics. It is going to be hard to pick," he said.
Meanwhile, Novak Djokovic dedicated his Barclays ATP World Tour Finals title to his ill father after defeating Federer to take the season-ending prize.
The world No.1 finished the tournament undefeated and picked up a cheque for $1,760,000 with his 7-6 (8/6), 7-5 victory over the man who had made the O2 Arena his own.
Federer was looking for a third title in a row and to extend his record to seven overall, but he could not capitalise on good starts in both sets.
Djokovic has not matched his phenomenal year in 2011, when he won three grand slam trophies and 10 titles in total, but he has come closer than many might have expected and has won more matches in 2012 than he did last year.
The 25-year-old's performances this week have been particularly impressive given the worries over the health of his father Srdjan, who remains seriously ill with a respiratory condition.
Djokovic said: "It's been a very long year, a very long two years, but a very successful two years. I didn't really know how I would follow up after an incredible 2011, but I believed that I have to use the time where I'm playing the best tennis of my life and I'm winning grand slams, finally realise what I need to do to win the major tournaments.
"This was my time, my moment, and I needed to step in and really believe in my ability. So throughout the whole season I've had lots of success and had some disappointing losses at big events, in a couple of major finals.
"But all in all it was a fantastic year where I've had to face a lot of difficulties off the court as well.
"Especially coming into this tournament, having my father fighting his own fight for health gave me extra strength that I wanted to play for him in a way. That's one of the reasons I really gave it all every match. This was a title for him."
Djokovic will leave London later today to visit his father, and he said: "At a certain stage, it was very critical. We didn't know what tomorrow brings. But now he's much better and he's recovering. He's still in intensive care. I'm going to visit him tomorrow and see how it goes and try to bring a trophy with me and at least make him smile."