I suppose that whether life is a competition or not depends on the person. Some people are driven to compete in various ways; and I don't think there is anything wrong with this. Competition is one of the fine qualities in human nature--whether it is used for good or evil purposes depends on the individual and the situation.

My goal in life is to know everything there is to know--to perfection. I suppose that this is competition; but is it wrong? I don't think so. (This is obviously a competition that I'm not going to win but I still strive anyway.)

Ultimately, competition is very fun and is necessary for our happiness--this is why we enjoy sports so much. Obviously, it can be taken to absurd extremes. However, if taken in moderation, all will be well.