If I feel I'm not influencing games, not scoring goals or making goals, then that's the time I'd pack it in.

I had an early taste of fame. I was 20, going out with TV presenter Dani Behr and we'd have paparazzi chasing us. I'm not comfortable being photographed, though I accept it is part of the job. I had to ask myself, 'What comes first, being a celebrity or footballer?

I had my footballing heroes such as Bryan Robson and Diego Maradona but my dad was a rugby league star, and he was my real hero. But the relationship with my mum was rocky and we saw things that would affect any youngster.

Celebrity culture, it's everywhere, isn't it? It's reality TV, Big Brother. I didn't become a footballer to be famous, I became a footballer to be successful. I didn't want to be famous. Now people want to be famous. Why? Why would you want people following you about all day?

I have always considered myself to be very fortunate. To play for the biggest club in the world, which also happens to be the team I supported as a boy, means I have never had to consider changing away from Manchester United.

A lot of people don't know that my father is black

He was a professional rugby player in the area that I played as a youngster. So a lot of people who I went to school with knew who he was and knew that he was black. So I would get racist taunts in school.