NEEDING HELP TO BECOME A FIREFIGHTER?

IM A 20 YEAR OLD MALE AND I LIVE IN INDIANAPOLIS,IN AND I WANT TO BECOME A FIREFIGHTER BECAUSE I WANT TO PROVIDE FOR MY FAMILY AND HAVE A SUCCESSFUL CAREER AND TO SHOW MY YOUNGER BROTHERS THERES MORE TO LIFE THEN TO BE IN THE STREETS BUT THE PROBLEM IS.IM UNDER 21 AND I JUST WANTED TO KNOW WHAT CAN I DO OTHER GO TO SCHOOL AND MAJOR IN FIRE SCIENCE TO HELP ME BECOME A FIREFIGHTER. WHAT KIND OF ACTIVITIES CAN I DO. LIKE JUNIOR FIREFIGHTING OR ANYTHING. I ASKED AROUND AND EVERYONE SAID I CAN JOIN THE MILLITARY AND BECOME A FIREMAN THROUGH THEM BUT MY WIFE WONT LET ME. SO IS THERE ANOTHER WAY I CAN PROPARE MYSLEF TO BECOME A GREAT FIREFIGHTER IN INDIANAPOLIS. PLEASE HELP AND THANKS