Check to be sure they are reasonable. Take control of your life. Helplessness is a terrible feeling. While you may not be able to change everything, notice the things you can change. Discover meaning in your life.
Some people find meaning through religion, some through learning, some through service.
Enjoy the contribution you make. See the purpose of people doing good. Don't compare yourself to others. Your sister may be a wonderful cook. Your neighbor may be incredibly organized.