Part of happiness depends on personality. Some people have a naturally happy nature. We all know people who are cheerful andĀ optimisticĀ most of the time. Their upbeat personalities make it easier for them to be happy.
So what does that mean for people who are born with a personality that's on the grumpy side? They might see the faults in people and situations instead of the good. Their mood might be glum more often than it's cheerful. But if they'd like to be happier (and who wouldn't?), it is possible to get there.