Drab, frizzy, un-shiny hair?

okay so i'm not trying to sound conceited, but i've always been known for my hair. i've always been really lucky when it comes to the hair department, and people always complimented me, and that was kind of my trademark. but lately it's been frizzy, drab, it's lost it's shine and it's bounce, etc. i shampoo/condition every other day. does this have to do with getting older? i'm 14 and this just started happening. please give me some advice...?