Nope, it's fine, I know people with 20yo that like LP.
Not sure whose my fav bands...Emir Kusturica and the No Smoking Orchestra do rock, Goran Bregovic, Xutos e Pontapés, Moonspell, Silence4, Dimmu Borgir, Pink Floyd, maybe The Verve, Cake, Gorillaz, Jan Garbarek, Rhapsody, Saint Germain, Yann Tiersen, US3, Gotan Project, Dust Brothers, Groove Armada, Chemical Brothers and so on...anything that has sustained quality. If Marilyn Manson wasn't so extreme on how he passes his message he would make on my list, damn good expression, Dimmy Borgir takes his place.
Bara, if you're after Punk, I'm not sure of your age, I suggest Pennywise and NOFX, they were my favorite Punk bands, I'd still listen to SUM41, Blink182 and...can't remember any other. If you like the guitar, move on to dark metal :p It's far more beautiful and pure than Punk, punk is just teenage joy.
ooo found a video on youtube with a very nice dark metal, has a great solo, and even better for you, it uses the 300 for images. lol, tell me if you like the guitar.
http://uk.youtube.com/watch?v=BkKl9nbtVto