God’s graces require the cooperation of the person, so no, obviously not everybody is going to be happy with whatever vocation they have, married or otherwise. But this isn’t because the vocation itself does not offer joy.
A person called to matrimony can and will have a painful pang of yearning within them, for being able to someday fulfill that call. But, this doesn’t mean the person will be miserable until that day happens. If they are taking that call seriously, they will be making proactive, calculated actions in there to move them closer to that goal. If they aren’t… well… they might end up remaining single forever, even if God didn’t desire that.