Will smiling a lot make your face less saggy?

Maybe because I have some flesh, I haven't sagged much yet.

I'm worried that I might lose weight quickly if I go on a diet.

I'm worried I might become like a bulldog. ㅜㅜ

Would I be less nervous if I smile a bit? ^^

Does it matter? Haha

Maybe because I didn't laugh enough? I don't have many wrinkles around my eyes.

I'm concerned about nasolabial folds.