You also have
If you have the ability to complain about something, you also have the ability to take the positive action that will make it better. And taking positive action is infinitely more effective than merely complaining.
If you have cause to get angry, then you also can turn the energy of that anger in a positive direction. You can then resolve the situation in a way that is peaceful and valuable for all concerned.
If you have reason to be frustrated, you also have the motivation necessary to get beyond whatever is frustrating you. Whether you work to eliminate the cause of your frustration or grow beyond it, no frustration ever has to continue troubling you.
If you have experienced disappointment, you also have learned a valuable lesson. Go forward, apply what you have learned, and transform your disappointment into a positive turning point.
If you have known loss and sadness, then you also have gained a profound understanding of how very precious life is. Take the opportunity, for which you've paid so dearly, to raise yourself to a whole new level of meaning and fulfillment.
If you face a difficult challenge, you also have the opportunity to grow stronger, more capable, wise, experienced and resilient.
Embrace those opportunities, for in them you will find the sweet substance of life.