No doubt you've heard of Avenged Sevenfold. (Alternative rock if you have not)
Also Three Day's Grace is a good one.
EDIT: More Alternative rock bands are Falling In Reverse and Escape the Fate if you're interested.
 
but im not like 40 years old
neither am I, but that doesnt stop me from listening to artists such as
  • Led Zeppelin
  • The Who
  • AC/DC
  • Heart
  • Pink Floyd
  • Rush
  • Steve Miller Band
  • The Police
  • Van Halen
  • ZZ Top
  • Blue Oyster Cult
  • Boston
But I suppose if you want to have that attitude towards music, then some more modern ones might entail
  • Gorillaz
  • Bang Gang
  • System of a Down
  • Rammstein
  • Cobra Starship
  • Awolnation (a couple of them anyways)
  • Dragonforce
  • EVE6
Might be a little more helpful if you told us what types of music you listen to
 
I see Skillet, Sum 41, and Sick Of Sarah in there so props to that. Maybe try some Breaking Benjamin, AFI, or The Offspring.

Offspring is fine..but

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try deltron 3030, it's a futuristic rap opera that is produced, mixed and rapped by the same people that made the first gorillaz album; damon from gorillaz also has a gig in there somewhere.

also try dj shadow - endtroducing if you like the avalanches.