The look does not matter in fact, with or without the rock t-shirt and hoodies. The important thing is what you feel, and how you express your love for music, no matter how strange it might be to other people. You can rip your denims if you feel you can appreciate Tokio Hotel's song more, the freedom is yours. Or if you look like a company executive but considers himself a groupie in the inside. Music is in the heart. Songs are better listened to, it cannot be held or smelt.
On the other hand, what about if you find yourself not capable to love music? What about if you can't appreciate music as it is? Wait, do not count yourself a strange person. Perhaps you just haven't found the right match of a song for you. Or perhaps you are surrounded with artists that do not go well with your liking. So here is what you should do:
There are some folks who like to exercise their eyes with the Television rather than just listening. If you are one of those then you are not alone. You can actually count yourself fortunate as right now there are various music channels that you can easily switch to and fro just by sitting in the sofa and using the remote control. These people, we can call as more of "graphic," who are enticed with what they see rather than what they hear.
While people who have keen ears rather than keen eyes prefers to separate from the world the moment they plug in their headphones. If you identify yourself as one of them, or something between visual and aural then you are almost one step to learning how to understand music better. It doesn't matter if you are "visual" or an "aural" type of individual, no problem with that, as music can be attained from both medium. Afterwards surprise yourself by sporting a nirvana rock t-shirt if you happen to discover you like Limp Bizkit.
Music touches our hearts when we are most sensitive. When you are blue for example, ballad songs all of a sudden seems a little more fascinating to you. And that also is the time you start to fancy other ballad songs. Or at times, you enjoy a certain genre of music according to your environment. Starting when you are a kid for instance, you find yourself whistling to the songs of Bob Marley, hundred percent you'll like rasta beat.
To conclude, what about if you find yourself still unable to like music just like to rest of music-lovers? Don't fuss probably you aren't born to love music. Probably you have other interests. Go out and look for it.