You can be taught the job from another brickie. You don't need any academic qualifications to get the job. This is the same for some other manual labour intensive jobs. You can be taught how to do it on site so to speak. An electrician for example doesn't need a degree but does need to pass the...
My advise is to go back to school. Either college or open university and get the qualifications you need to do the job you really wouldike to do. Obviously within reason , if you are not especially academic you are not going to be a brain surgeon. However there are plenty of other jobs you can...