Recent decades have seen a rapid decline in mental health among early adolescents. Moreover, new patterns have emerged in mental health issues, as a higher number of children from more resourceful backgrounds are getting affected in ways previously unseen. This development has by some researchers been described as a “new form of marginalization”, where mental health issues are no longer predominantly present among traditionally marginalized groups. A growing number of researchers have linked the decline in mental health among youth to a rise in experienced performance demands in general, but particularly in relation to social media. This study aims to understand how early adolescents’ experiences of performance demands when engaging with social media and their general well-being are structured by gender and class. The study was conducted among pupils in lower secondary education in Denmark and consists of focus group and individual interviews evenly distributed between four schools varying greatly on socioeconomic status of the school district (n=80). Connections between experienced performance demands on social media, self-critique and mental health complaints were common among middle/upper middle-class girls. However, girls also more often felt pressure to present stereotypical representations of gender and idealized versions of themselves on social media, but also felt surveilled and at risk of being labeled as “slutty”, shameful or lacking self-respect. Many middle/upper middle-class boys hardly ever posted pictures of themselves to a wider audience, as gender stereotypical representations of boys were viewed as distasteful and associated with masculine working-class culture.