A study of 2,000 UK adults found a fifth have had their self-esteem knocked after being looked down on by someone they didn’t even know.
A further 17 per cent have felt down on themselves after comparing themselves to a celebrity, and one in 10 put the blame on Love Island.
As a result of their low confidence, more than a quarter of women won’t leave the house without ‘wearing a filter’ and applying some form of makeup.
And a fifth wear makeup in a bid to appear more confident to others than they really are.
The research, commissioned by Skin Proud, also found 53 per cent wished they were more confident in their natural skin.
Nora Zukauskaite, global head of marketing at Skin Proud, said: “We were surprised to find people care so much about what others look like – especially those they don’t even know.
“It’s always been known that celebrities and their seemingly perfect skin and bodies have had the power to make us feel bad about ourselves.
“But with social media opening the world up, perfect strangers’ seemingly perfect physiques are now adding to a general feeling of not being good enough.
“At Skin Proud we want to help everyone embrace their inner beauty and realise that what is seen on social media is often far from reality.”
The study also found 28 per cent lack confidence because they feel there is a lot of pressure to look a certain way.
And 14 per cent don’t feel secure in their own skin because their natural look is different from the image they portray of themselves on social media.
Blemishes emerged as a common cause of the confidence crisis for a quarter of those polled, while nearly a fifth will feel less confident because of acne.
As a result, 43 per cent of female respondents said they put makeup on to feel attractive – suggesting they would not without it.
The research also found women are more likely than men to filter their images for social media – 23 per cent of women compared to 14 per cent of men.
The main reason for going filter-heavy was to edit out blemishes, although 16 per cent try and enhance features like their lips.
More than a third will try and smooth out their skin, while a tenth will attempt to reduce the size of their nose.
Four in 10 also agreed that editing photos before posting them is totally normal now – and that everyone does it.
It also emerged, eight in 10 think it’s important to embrace self-confidence, according to the OnePoll figures.
One in four also say that if their peers and other people they followed on social media posted more unfiltered images, they’d be more likely to do the same.
Another quarter says they’re likely to post more filtered images as they get older – and one in five will do it less.