U2 bassist Adam Clayton has revealed he's "a much happier bunny now" after overcoming mental health issues and has urged others to seek help if they are feeling unwell.

Clayton is an ambassador for Walk in My Shoes, the awareness and education initiative of St Patrick's Mental Health Services. On Friday he will be one of 30 celebrities and bloggers sharing selfies as part of Walk in My Shoes' #MindYourSelfie information campaign. 

"If someone is feeling a little bit strange and they have a mental health issue, it is curable," he told 2fm's Eoghan McDermott Show. "It is not something that you have to live with for the rest of your life. It is not something that will stop you being part of the workforce. But you do have to talk to people about it and you do have to get help. And you can recover." 

Adam Clayton at the #MindYourSelfie launch with (L-R) 2fm's Eoghan McDermott, model Alison Canavan, broadcaster Rebecca Horan and model Corina Grant

Clayton described modern life as "a very complicated world" where "we get it wrong sometimes". 

"I've certainly got it wrong in my own life and relied too much upon alcohol and other things to get me through something," he admitted. "That was a diversion in my own life that I wish I hadn't taken. But it got me back and I am where I am now."

Clayton said he "pretty much had a Eureka moment" when it came to his own recovery.

"I was fed up of the way I felt constantly," recalled the 56-year-old. "In my particular case it was difficult for me not to go, 'Well, you've got an amazing life. What's wrong with you? What are you on about?' Eventually I just got fed up of feeling fed up."

At the time, friends who had received alcohol and drug treatment told Clayton that he too could overcome his problems and feel better. 

"At the root of all of this, of addiction, certainly in my case, was a mental issue," he said. "It's how I approached the day. I was able to get help to revise my thinking and turn that around. So I'm a much happier bunny now."

Clayton also discussed U2's four homecoming shows last November at the 3Arena. 

"It was really great to be able to play that show, in Dublin, indoors again, because we hadn't played Dublin indoors since the last Point show that we did way back when at the end of '89, really. And it was a real Dublin crowd. It was a real home crowd," he said. 

U2 at Dublin's 3Arena in November

"The first night, I think, we were kind of wandering around bumping into things because it was unfamiliar. But by the fourth night we were pretty comfortable."

When asked if his attention ever wandered while playing any of U2's classic tracks, Clayton replied that the songs were part of him.

"They're a little bit like an old, comfortable pair of shoes," he explained. "You've been amazing places in them. They've maybe seen better days but you know them inside out. Those songs, they mean so much to the people that come to the shows [that] it's kind of an amazing gift to have one of those songs and be able to perform it to people." 

For more on the campaign, see walkinmyshoes.ie or #mindyourselfie.