Ricky Williams

The former NFL running back retired in 2012 and has since opened up about his struggles with social anxiety, BPD and avoidance disorder at the height of his sporting career.

He said: "I was 23, a millionaire and had everything, yet I was never more unhappy in my life.

"I felt extremely isolated from my friends and family because I couldn’t explain to them what I was feeling. I had no idea what was wrong with me.

"After I was diagnosed with social anxiety disorder, I felt immense relief because it meant that there was a name for my suffering. I wasn’t crazy or weird, like I thought for so many years.

"As part of my treatment programme, my physician prescribed an antidepressant, in combination with therapy. Soon thereafter I was able to start acting like the real Ricky Williams."