If you dream of taking the part at some kind of competition and winning the second place, it means that you are doing great in your life and going on the right direction, but only if you feel happy about it. If you do not feel good about it, you have to relax, do whatever you do and enjoy your life. You do not need to be first one in all aspects of your life. Perhaps you are the person who tends to win among the others, therefore you feel sad about it. The second place is the good winning point.
Read more about dreaming of Second place in other dream meanings interpretations.