I truly believe this is a real problem! Not a problem I ever had, as I have never been particularly good looking. Passable I think, but never gorgeous. Certainly not as a teenager, when I was hugely overweight with a bad haircut and dressed much older than my age.
Aaaanyway, I've written about this before, but my late mom was a raving beauty. The most beautiful girl in her home town sort of thing. She struggled a lot, as her whole identity was wrapped up in being a beauty. So, when she was middle aged and still looked beautiful to me, but a bit podgier and no longer a head turner, she really did struggle with it.
It wasn't a happy ending I'm afraid, as she developed a drinking problem, which started with a very low carb diet, as she wanted to be thin. She discovered that vodka and diet coke was low carb (yes, I know it doesn't work on a low carb diet, but she didn't know that at the time), and drank it quite a bit. She discovered to her delight that if she was a bit pissed most of the time she didn't want to eat and she did lose A LOT of weight initially. But then she puffed up with all the booze which she was then very addicted to. She looked ancient and bloated. She went into hospital once and was fed with a drip and couldn't drink alcohol while she was there, obviously. She honestly looked about 20 years younger when she came out.
Anyway, she kept on drinking and eventually quit with AA, but it was too late and she died about a month later. She was in her fifties.
Anyway, since then I've steered clear of regular drinking. I basically don't drink at all. I also steer clear of obsessive dieting and obsessing about looks. These things were what ended her life too early from where I'm standing.
The worst thing is that she was a wonderful, intelligent woman, with so much more to offer than her looks. But she thought that as soon as she didn't look the absolute best, her life wasn't worth protecting.
Don't be like her!