01/05/2012 at 06:00 PM EST
may be the star of one of the most popular movie franchises
of all time, but he still has a thing or two to learn about dating.
Luckily the actor has found love
with girlfriend Rosie Coker
, a production assistant he met on the set of the last Harry Potter
"I hated dating, because I'm crap at it! With Rosie, I didn't know what was appropriate, like on which date you're supposed to try and kiss her," Radcliffe tells Sunday's Parade
Early on in the process, Radcliffe, 22, recalls, "I went to kiss Rosie and at the last minute lost my nerve and ended up kissing her neck, which is a very intimate place to kiss somebody on the second date. Fortunately, she just found it really funny."
Sounds like the actor's dating flub didn't hinder things with Coker.
"When Rosie's here, every day seems better," he says. "Ultimately, I think, it comes down to that – having somebody in your life who makes you happier than you thought you could be."
Radcliffe, who recently ended a Broadway run in How to Succeed in Business Without Really Trying
and will next star in The Woman in Black
, says he's "not an easy person to love."
"There are lots of times when I'm a very good boyfriend, but there are times when I'm useless," he says.
"I mean, I'm a mess around the house. I talk nonstop. I become obsessed with things (fantasy football, most recently). And she listens to it, and she loves me for my oddness, my awkwardness – all of those things that I hate about myself."