"Be happy" as phrased is putting the cart before the horse.
Your emotions define what you do. You'll have a different reaction to a situation if you are happy vs angry when it happens. It's not something that can be helped. The best attempt you can make at "Be happy" is to do things that make you happy, whether or not it actually works. If your emotions define what you do, the hard part is to get off your butt and try to do those things. It requires an emotional transition, which isn't something that can be forced, but when it happens you need to take advantage.
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"Be happy" as phrased is putting the cart before the horse.
Your emotions define what you do. You'll have a different reaction to a situation if you are happy vs angry when it happens. It's not something that can be helped. The best attempt you can make at "Be happy" is to do things that make you happy, whether or not it actually works. If your emotions define what you do, the hard part is to get off your butt and try to do those things. It requires an emotional transition, which isn't something that can be forced, but when it happens you need to take advantage.