Post some videos on Youtube. If you give me a link to your stuff, I'll spread it. I have connections to teens across the country, so your name will be out there. I can't guarantee that will be a good thing, though, because I haven't seen you play. If you make your own songs, then you could also submit a disc to a local radio station that plays local bands.
Hang out in NYC Central Park on Saturdays in the summer. Perform your gig, no more than 3 hours. Have your own power for sound. Clean up after yourselves, and your audiences. Take trash with you for proper disposal. You will gain popularity, and respect.