This is a very healthy attitude, and people often miss it. Every feeling/emotion/state of mind is impermanent. It will come and go on its own, its biology and there's nothing you can do about it. It's trying to "cling" to a specific state, forever, that leads to our own suffering. The moment you've move from "I feel happy" to "I hope this lasts forever" is where you will suffer. Just be a witness to the coming and going, you witness happiness occurring, you don't become happiness, and its the same for other feelings and states.

Is there though? I don't think modern psychology does. Where are these psychologists who don't think emotional ups and downs are a normal healthy part of life? Even in media it's often recognized that people being happy (or even just too tranquil) all the time, is wrong and creepy/unsettling. That said, it's absolutely true that advertisers are constantly pushing a narrative that you should be in an endless pursuit for what you don't have and that if you only buy what they want to sell you it will make you happier and improve your life.