There are people

There are people who's rewards center of their brain does not function completely or normally. Everything else about their brain works normally and in some ways works better than normal, like their sense of reality.

They do not have a mental condition or problem. They do not need drugs or therapy. They get by in life quite well. In fact, you wouldn't even know they are one of those people unless they told you. That's how normal they are as functioning people.

They experience life as everyone else, they just see it differently, as uniquely to themselves as everyone else sees life unique to them. The only difference is that they don't feel the overwhelming sense of happiness for more than a few moments every now and then.

There is nothing wrong with them, no more than any other normal person. There is nothing to change in them anymore than any other person. There is nothing to consider them abnormal any more than any other person.

They just are themselves as everyone else are themselves. They are unique as everyone else. They don't see constantly thinking that wanting to be happy is a way to be. They don't have the problem they won't be happy as other people if events don't happen to make them happy.

And for that they are often better, more normal people. They're not fixated on wanting and striving to be happy and dispair when it doesn't happen. They already know the extent of their happiness and the extent happiness will ever bring them.

They are already normal and happy as and with themselves.