The singer became a global superstar at the age of 21 in 1987 with the worldwide hit Never Gonna Give You Up which catapulted him into TV studios and onto the front pages of newspapers.
His early success brought him fame and so much money he quit his pop career at 27.
Astley, 58, has now written about his childhood growing up in Newton-le-Willows, Merseyside, his pop career and musical comeback in his new autobiography, Never.
He told the Cheltenham Literature Festival he started playing in local bands as a teenager and soon switched from the drums to vocals.
Record producer Pete Waterman, who co-founded Stock, Aitken and Waterman, spotted him playing in Newton-le-Willows and gave him a record deal, which propelled him to stardom.
"I have often said actually that I think it should be a legal thing that when someone signs a record deal, and I know this sounds a bit over the top, but that they get a therapist," Astley said.
"They get a few hours where someone says look, just so you know, you're going to have to think about things slightly differently if this really takes off for you.
"Because it's amazing, and I wouldn't swap it and I wouldn't want to retract any of it or anything, but it's absolutely, it's inhumane what happens to people, it really is.
"I'm not here to get a violin out and get people to feel sorry for myself. I said at the very beginning of this, I'm very lucky, I'm very happy.
"I think what you go through when it goes like that is kind of almost... it's too much.
"We see it every year, every six months, you see someone's had a breakdown, somebody's like... to the nth degree, someone literally drugs themselves to death sometimes because of that pressure."
Stock, Aitken and Waterman were unknown at the time and were still to have their first top 10 hit - later going on to have 300 Top 75 hits and 30 platinum albums and producing the likes of Kylie Minogue, Jason Donovan and Bananarama.
Astley explained he had never heard of them, and it took a while for his career to take off as he was always at the back of the queue.
Never Gonna Give You Up was recorded in October 1986, but it was not released until the following summer after Waterman "stuck it in a drawer". after several delays.
"I just said to the guy I was with, 'I'm going home, I'm done'," Astley remembers.
"I just thought they can call me, they can whatever, but I'm just not doing this anymore, this is not what I signed to do.
"People said I was really brave, it wasn't. It just seemed ludicrous and eventually RCA kind of made him play the song, and as they say, the rest is history."
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