I WANT BRACES SOOOOOOO BAD!!!?

HEY GUYS MY TEETH ARE REALLLLLY CRUCID AND MOST OF MY CLASSMATES HAVE BRACES... IM ONLY IN 7TH GRADE AND MY SISTER IS IN 11TH GRADE AND GOT HER BRACES WHEN SHE TURNED 15... SHES BEEN WANTING THEM FOR A LONG TIME AND IF I GET THEM NOW SHES GUNNA BE JEALOUS. SHOULD I JUST WAIT TILL NINTH GRADE BECAUSE SHE GRADUATES OR ASK MY PARENTS... BTW IM KINDA SCARED TO ASK MY MOM BECAUSE SHES GUNNA BE MEAN ANYWAY JUST GIVE ME SOME ADVISE THANKS ILY