Radcliffe has decided to drop alcohol for good after realising he couldn't stop at just a few drinks.
In an interview with GQ magazine he said: "I became so reliant on [alcohol] to enjoy stuff. There were a few years there when I was just so enamoured with the idea of living some sort of famous person's lifestyle that really isn't suited to me."
The former child star has been sober since last summer, not long after his booze-fuelled 21st birthday celebration in St Petersburg.
Nowadays, Radcliffe is choosing quiet nights in with his girlfriend over parties and drinking sessions.
"I'm actually enjoying the fact I can have a relationship with my girlfriend where I'm really pleasant and I'm not ****ing up totally all the time," he said.
"As much as I would love to be a person that goes to parties and has a couple of drinks and has a nice time, that doesn't work for me. I do that very unsuccessfully.
"I'd just rather sit at home and read, or go out to dinner with someone, or talk to somebody I love, or talk to somebody that makes me laugh.
"There's no shame in enjoying the quiet life. And that's been the realisation of the past few years for me."
Another lesson he says he has learned is: "Don't try too hard to be something you're not."
And as for his wealth, he said: "I don't know what to do with it. I'm very fortunate to have it, and it gives you room to manouevre. But the main thing about having money is it means you don't have to worry about it. And that for me is a lovely thing. It's not for fast cars and hookers."