Should i stay at highschool or go to tafe?

i have no clue on what to do. i am wasting my time at school because i have so many study periods and im only doing one tee subject (english) i don't plan on going to uni, well at least not straight after i finish school. i am in yr 11 right now and im not doing any subjects that really interest me. i am thinking of becoming a veterinary nurse or a nurse(for people) as im interested in medicine but not bright enough to become a Dr. i just need opinions. my friends obviously want me to stay at school but im just confused on what i should do...