Jobs/Careers that fit my interests?

I'm in 8th grade,and I'm taking a class called Exploring Careers,and I have until tomorrow to change the career I chose.I chose Forensci Anthropologist,and I change my mind about it.I don't want to do something I'm not extremely into,or go to school 13+ years,or have a tough time looking for employment in(it's competative)8-9 is my limit.I really like law enforcement,graphic design,mechanics,and engineering.I want a job that I will like,fun(for me,though no job is),and that involves art,law enforcement,mechanics,and or engineering.I really wanted to be a mechanic or nurse in the Air Force,but my dad says that's a job for monkeys,and I won't get anything from it.(He's says that now,but when they're saving his ***,he'll be all for it)I'm 14,goth/tsundereotaku/tomboyish-like,and I really want a job like that.Any suggestions.