There’s a difference between parents who want you to be happy, and parents who want you to look happy.
If your parents want you to be happy, they will be there for you when you need them, and help you with your struggles. They’ll take your pain seriously. They wont make fun of your problems when that hurts you. They’ll point out your good sides. They’ll let you know they hold you valuable and important no matter what the rest of the world says about you. They’ll make sure you know they’re on your side, here to protect and get you out of trouble, that if something happens you have backup, you have a safety to fall back on. They’ll make sure you have a place you belong to, place where you’re welcome and wanted. They’ll be a source of comfort, warmth and support.
If your parents want you to look happy, they’ll demand that you stuff down your emotions and play an act of a child who doesn’t need anything or anyone, who is just fine the way things are, no matter how bad things are for you. They’ll dictate what you’re allowed to think of them and how you’re supposed to react on anything and everything they do. They’ll demand you hide your pain, your symptoms, your anger, your fear, anything that makes them look like less than perfect parents has to go. They’ll let you know that they are important, you aren’t. Their emotions and needs and desires are important, yours aren’t. Their pain has to be paid back, yours has to be ignored and forgotten. Your life falls back on what is and isn’t convenient to them, every part of you is judged only by how much use they can have of it. And of course, they’ll tell you they did it all for your sake, because if they didn’t, who knows how awful you would turn out.
If they say they want you to be happy, but their actions tell you that you need to look happy “or else”, they’re abusive parents, and they do not care about your happiness.