I first became interested in style when I was 16 and I had my first couple of gigs. I realised I couldn't look like the people I was performing to. Not in a condescending way, but just that it would be weird if I was wearing exactly what someone in the crowd was wearing.

When I was about 14 I remember thinking when it came to proposing to my future girlfriend, I'd make a CD with all her favourite songs and a message that said, "Will you marry me?" Shows you what a romantic I was. No one listens to CDs any more. It's all about iTunes.

People used to say poems were different to songs but I don't think they are.

If I go to an awards ceremony, I wear a suit, of course I do. I am proud to be there. If there are young kids looking at pictures of me, I want them to feel that they should long for the opportunity to go somewhere really smart and wear a beautiful suit, rather than to reject that.

My glasses are from Cutler & Gross. They're not prescription: I just love wearing them. I used to wear Ray-Ban a lot and then I realised that a lot of the things I've started going for are a little bit more refined. I liked the fact that I was supporting a British brand, somebody I could have a relationship with and people that I could talk to.

I didn't take it seriously myself at the time, but now all of my old teachers are supportive. Even my principal - I sold out the O2 Arena in London, and he came out to see me, which was really cool. I actually put a picture with him on my Instagram, and I think and he's wearing one of my snapbacks.

I don't think I've had to change anything, really, apart from being more serious and focussed on my drive. One thing I've realised is that you get out what you put in and because of that my work rate has increased ten fold.