What kind of career should I study for?

I'm currently in year 10 and have to chose my electives for next year.... I like and do well in industrial technology - timber, music, history and maths sorta.... I'm tryin to think of some sort of career I can study for... I was thinking a civil engineer but i don't know if I'm smart enough.... I was also thinking of a musician but I'm not sure if I will be successful because I'm a terrible singer but I can play the guitar pretty well... Anyway I need any ideas for wot I shud do with my life?? LOL thanks