Millie Bobby Brown has said was forced to switch schools due to being bullied and says it caused "a lot of anxiety and issues" that she still deals with.

The 15-year-old Stranger Things star, who has been a vocal anti-bullying campaigner and last year was named the youngest ever Unicef Goodwill Ambassador, has opened up about her experience in an interview with fellow actor Orlando Bloom for Glamour UK's May issue, which is the first Activism edition.

She said: "I was bullied at school back in England. So, it’s extremely important for me to speak out against bullying. I actually switched schools because of it, it created a lot of anxiety and issues that I still deal with today."

The actress made headlines when she was forced off Twitter due to cyberbullies and spoke about how that affected her.

"I have dealt with situations both in real life and online that are soul breaking and it genuinely hurts reading some of the things people have said", she continued.

"Being in this industry we have become so aware of negativity and it’s made me appreciate the love so much more. People receive so much love on social media and then only focus on the hate."

The British star said that one of her goals as a Unicef Goodwill Ambassador was to combat "negativity" on social media.

"Young people's lives are increasingly under pressure. First of all, I want to make sure that children are protected from violence and exploitation", she said.

"I also want to combat the negativity on social media - I have experienced it - it's like a disease. It's negative hate that is genuinely so horrifying to me. Climate change is so important too."

Brown concluded: "My message is always to spread love, light and positivity. The world can be a scary place sometimes, but it’s important to remain hopeful and to be kind to others."

She is set to make her film debut in Godzilla: King Of The Monsters, set to be released in cinemas in Ireland on May 29, and can next be seen in the third season of Netflix's Stranger Things which lands in July.