How do you sound?

Have you ever noticed the way certain people can say the word fuck and it sounds so natural coming out of their mouths? Then there's people like me who say it and it sounds like a little girl trying to act like a grown up. There's also people who sound like they're trying too hard, like my neighbor. She sounds like she's only saying it for the emphasis, but you just know she doesn't say it often because it sounds so weird from her. The Greenday CD made me think of this. (yes, I'm going to talk about Greenday again. I'm addicted, so help me!) Billie Joe can say fuck like he's saying hi, mom. It just sounds so natural. In the song "Boulevard of Broken Dreams" when he says:
Read between the lines
What's fucked up and everything's all right
it sounds like he could have said "what's screwed up" or "what's messed up" and it would have had the same inflection. You listen to Eminem, however, and it's a different story. In his song "Kill you" he says:
You don't wanna fuck with me
and makes you feel as if you've actually *been* fucked. There is so much venom in the way he says that one word. Of course, there's a lot of rage in all of his words, but in fuck especially. I'm not saying I mind it, not at all. Why do you think I listen to Eminem all the time? I'm trying to learn how to say fuck like I mean it. Because I do mean it.