It is true that people with high IQs sometimes can't live with their level of knowledge and understanding of the futility of their sad, little existences and they decide to off themselves exactly because life is so meaningless. OTOH regular people who are depressed are more likely to just be suffering some chemical imbalance or emotional trauma. It doesn't mean they are incapable of recognizing how shitty life really is, they're just depressed for other reasons as well.

Other hyper intelligent or gifted/talented individuals remain positive about life and are inspired to attempt great works right to their final breath. Death is the only absolute truth of our existence after all. So what you choose to make of your short time until you die is completely up to you.