The Chafetz Chaim wrote: "When you see that someone is sad, there is an obligation to try to console him. This is a fulfillment of the mitzvah (good deed) of comforting mourners, which includes helping anyone overcome emotional suffering."

For this reason, even if you do not become sad easily, still try to find beneficial ideas for overcoming sadness. Although you might not need them, others will -- and you will be doing an act of kindness by helping them.