In my opinion, it's just another throwaway term like "it gets better". It's not about what we deserve, but what we are gonna get as sentient beings. I don't think anyone deserves to suffer yet suffering is an integral part of our existence. As far as happy goes, like love, it's a romanticized word that isn't really grounded in reality.
I prefer the word "content" - with neuroticism being the polar opposite. Where you fall on the spectrum is determined by your genetics, neurological makeup, and the environment you grew up in.
Yes you deserve contentment and yes you deserve the right to end your suffering (everyone does). The truth is - life sucks! Our goal is to try and make it suck less...which I am personally incapable of doing. Some people can pull it off quite well. If we keep searching for happy, we will wind up dissapointed because what we are searching for doesn't exist. Plesentries don't tend to last for long. Does this make any sense?