Nearly a fifth of young Britons would consider plastic surgery, a survey has found.
The research discovered that over eight out of 10 people aged 15 to 25 would change something about their body.
Over all, young Britons' body image was slightly worse than in 16 other countries in the survey.
Girls cited their thighs, breasts, bellies and skin as the features they most disliked.
Boys also tended to feel insecure about their skin, as well as their eyes and hair. These trends were found across participants from all countries in the survey.
Joeri van den Bergh, of InSite Consulting, which carried out the survey, said: "The current generation of youth is referred to by scientists as the most narcissistic group ever, therefore it is not surprising that looking good is so important."
The results come after Dr Helen Wright, headmistress of St Mary's Calne school, Wiltshire, last week described young people's "skewed, distorted approach to appearance", sustained by celebrity culture.
Dr Wright singled out American reality television star Kim Kardashian as contributing to the "premature sexualisation" of adolescents and leading them to aspire to a life of "glitz and sparkle".
However, participants responded that being caring, honest and friendly were qualities they aspired to more than being popular or famous.
The survey was based on responses from 4,065 participants aged 15 to 25 from the US, Brazil, Russia, India, China, Germany, France, Sweden, Denmark, Poland, Romania, Italy, Spain, the Netherlands, Belgium and the UK.