I was never a 5-star beauty, but I was probably prettier as a young adult than I am in middle age. This is a common, natural human experience. However, strong repressive influences inhibited my confidence. As I have aged and learned more, I have mostly overcome my anxieties and now feel more confident. Those who are both young and confident are indeed lucky, but perhaps they have not been exposed to so much repression. I am sure good sex education can help, so I hope these problems may affect fewer young people now than in previous generations.
Sexual repression may lead to pathological sexual conditions. The repression causes anxiety about normal sexual behaviour and feelings. The individual may then come to unwittingly associate sex with anxiety, and vice versa. Anxiety may become arousing even against his/her will. This can cause a distressing feedback loop, where anxiety and arousal become more frequently and closely associated.
There are rightly strong social taboos and sanctions against the expression of pathological sexual conditions, such as those concerning abuse of children, animals, and other vulnerable groups. If repressive anxiety and arousal are already becoming associated, as explained above, then this may lead an individual to be unwillingly aroused by the quite normal anxiety associated with the discussion, reporting, and worry about those pathologies. This may cause a similar, even more problematic feedback loop, where repeated episodes may reinforce the anxiety and pathological issues.
I am writing from personal experience here, too. This almost ruined and certainly harmed me in my younger years. As I already said, I have mostly liberated myself from my former anxieties, and I continue to do so. I realised these things might be happening to me and that it was important to break the harmful loop at source by freeing myself of repressive thoughts and influences, and by learning about and practising healthy, positive sex.