And he did his best to convince our listeners as he fielded questions from them.
Fourteen-year-old Laura Barritt from Bangor, north Wales, asked the Tory leader what he'd do about underage drinking and whether his party would consider creating public areas for teenagers to drink in.
Laura Barritt is a 14-year-old schoolgirl from Bangor, Gwynedd
Mr Cameron said: "Some of the friends I had, the ones who had the biggest problems, were the ones who were actually never able to drink anything at home.
"Whereas the ones who drink responsibly are the ones who, you know, were given a glass of wine, or a small glass of beer, or a shandy - just to get them to know, this is alcohol, this is what it does, you have to be careful.
"And I think that's the way to do it - in the home."
Asked what age he had first got drunk, Mr Cameron said: "I can't remember but yes, when I was a teenager, I did do some things I shouldn't have done - we all do."
Ross McKay, a labourer from Dunstable, wanted to know what David Cameron would do about Polish immigration.
Ross McKay is a 26-year-old from Dunstable, Bedfordshire
Ross said: "I'm just worried about the amount of Polish that are undercutting everyone.
"My mates are getting laid off. The next week it gets opened full of the Polish."
The Conservative leader told Ross that "we do benefit from immigration, but we do need some controls".
The Tory leader admitted his hands were tied because of Britain's membership of the European Union.
He said it was "too late with Poland", and that "there is absolutely nothing we can do in terms of Poland. We can in terms of future countries that join so we don't make this mistake again".
Good impression
Lauren put David Cameron on the spot about his focus on families.
Under a Tory government would she not "be worth as much" because she's a lone parent?
Why does he want to bring in tax breaks for married couples?
The Conservative leader told Lauren that he thought "marriage is a good thing".
David Cameron is on a week-long holiday at Harlyn Bay, Cornwall
He added: "I think commitment is important and couples are a good thing and at the moment the tax and the benefits system send out a signal that these things aren't important at all."
David Cameron spent more than half an hour taking our listeners questions.
Overall their impression of him was favourable, but many felt he had more work to do.
Lauren thought David Cameron came over "very well" but "didn't give direct answers".
Ross said he liked what he heard: "Labour have had their chance, they've had their time, they've done alright - but now I just think it's time for some fresh ideas."
He did, however, remain slightly sceptical: "I'm just worried I've been fooled. I just hope he isn't just doing it to fool me but some of the things he was saying were quite good."
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