Feeling alone in your teens and early 20s is a common thing.
It's claimed young people are more likely to feel lonely than the rest of the population.
A British survey has found that almost half of 18 to 24-year-olds have felt that way.
That's compared to a quarter of other age groups in the UK.
The study comes to mark Mental Health Awareness Week.
This Mental Health Awareness Week we're on a mission to let everyone living in loneliness know that their mental health matters.
Let's tackle loneliness together. Say #IveBeenThere#MentalHealthAwarenessWeek pic.twitter.com/8gUN9hAdej— Mental Health Foundation (@mentalhealth) May 9, 2022
Mark Rowland is chief executive of the Mental Health Foundation there, which commissioned the research.
"We know that loneliness is a key predictor for poor physical and mental health outcomes," he said.
"We saw during the pandemic that experiences of loneliness almost trebled."
"The longer that we live or experience feelings of loneliness, the bigger the impact on our mental health."