When I was a teenager I would have thought looking better would fix everything, but now I don't think so. I was considered unattractive in the past, now considered average/cute - but other things have gotten worse. If I were extremely beautiful maybe yes, like enough to be a model or actress and make a living from it. When you're just average/decent looking it's easy to start aspiring for a lifestyle you won't get.
I can only speak as a woman, if you are legit deformed and woke up the next day looking normal, or you lose 500 lbs, I'm sure that would be a significant improvement but for most girls going up or down a few "points" on this sliding scale of attractiveness is not going to fundamentally change anything. You can even see it in the myopic way some people answered here. "My life would be so much better if i were extremely handsome and desirable, instead of ugly," yea sure... wouldn't we all love to wake up like that. but it wouldn't change much actually if you just became average. Most people are not extremely attractive desirable billionaires and they're still content w their lives. I am just an unhappy person.
And no offense but most people who whine about being unattractive are just that. I sympathize with the truly "ugly," like those with genetic abnormalities, but the rest of ya probably fall within the "average" spectrum. You're looking at the lifestyles of a small minority of super beautiful people and wondering why you can't achieve that.
(On the flip side, I would kms if someone poured acid on my face, or if i was struck with some disease that put me in a wheelchair etc. but there are plenty in these situations who manage to live. Different constitutions. Religion probably helps for these types.)