I've been in a similar position. I got very good grades at school and everybody pushed me towards 'aspirational' type careers but my instinct was always towards 'assistant' or 'support' type jobs. For example I qualified as a teacher but just found myself longing to be the teaching assistant. Then when I left teaching all my instincts led me towards admin jobs which only horrified people further! But I've since come to the conclusion that I am just somebody who is happy following instructions and doesn't like to lead. Even though it's some people's nightmare to sit quietly doing admin all day and taking instructions from somebody, it's actually heaven for me. I have even come out of my shell a lot, i.e. in the process of my job I have to use the phone a lot in front of other people, when I first started I literally couldn't do it and would wait until the others in the office were on the phone to use the phone, but now (even though it's still my least favourite task) I can pick up a phone and it's not a big deal. Obviously if you want more money a career change might be necessary, but if you only want to leave assistant work because you feel like you 'should' be doing something better, don't let people tell you what you should or shouldn't be doing. If you know what you enjoy doing and it makes you happy then do it. Unfortunately as for health and fitness I can't think of any careers that aren't personal trainer or instructor but maybe somebody else will be able to help! Perhaps since you are on a 0 hours it is something you could investigate on the side without too much commitment?