bad hair dye made me look like im 90!!

ok so my hair is blonde but was growing out wit brown roots. i decided to dye my hair back to the brown color so i wouldnt have to deal with roots- i bout box kind that u do at home- and, well, my hair is now the color i wanted at the roots- but everywhere else its gray- with a silver and green tint in it. i jus dunno what to do- im 13 and well school aint as fun being called granny- lol im not sure what to do, i noe i should go to a professional probably but what should i have them do??? HELP! i could use any suggestions as soon as possible! email um to me at ANGEL_BAYBEE69@MSN.COM, cuz i probably wont check back at the board. thanks! xoxo-carly