Once you are signed on the dotted line, your life is the RAF's. But that does not mean that it is bad. No, it means, that at first it seems hard and you are doing lots of things that you do not do at home. But once you pass out of basic training and go on to do your trade training, then you find it to be a lot of fun, with new friends made and new places to go and see. For a decent honest job, that gives rewards and job satisfaction, then this is where you could look. There are lots of jobs in the RAF, so again there is some thing for every one.
Once signed, you are in for that length of time.