It's always tempting to try and change who we are to get somebody to like us better. But even little things, like saying you're really into a band you've actually never heard of, can get you into trouble. For one thing, those kinds of little white lies will probably come back to bite you sooner rather than later. But more importantly, you want him to like you for being you. Be proud of who you are and what you're about. He's way more likely to think you're cool because you raise goats for 4-H than for faking an understanding of the UEFA Champions League rankings. Being comfortable in your own skin is much more attractive than trying to be somebody you're not.
Now, was that so hard? All right, it was probably kind of hard. But you did it! You talked to a guy on the phone, and you didn't dissolve into a quivering pile of nerves. That's something to be proud of. So, take a deep breath, pat yourself on the back, and relax. Because, my friend, you rock.