The 33-year-old said: "Why am I coming back? It's been well documented what's happened to me since the last time I've been in a boxing ring.
"I've started looking after myself a bit better and getting fitter and that's how it started. I don't want to be fighting at four or six-round levels - I want to fight for world titles.
"It's about more than money, this comeback. People say nice things about me but they don't know what's been going on in between my ears."
Talking about the manner of the defeat against Pacquiao, Hatton explained: "I didn't want my career to end that way. It put me into retirement, which I never wanted to do. The manner of that defeat put me into some things which have been well documented...my life turned to mush.
"I got back into promoting which I loved - but it didn't quite fill the void. I got a huge buzz getting opportunities for my fighters and I was in the gym every day of the week passing on the knowledge - but it didn't fill the gap."