Soon they will have reasons to be unhappy for real. Do not get into this trap. See the positive rather than the negative in you. Optimism and a positive attitude promote good health. Research shows that the optimistic persons have healthier immune system.
Pessimistic expectations breed negative experiences.
No matter how bad things might appear, you can see a silver lining. There is someone who has worse problems. Misery loves companions. Reach out to such people. This will help both parties.