How can you have two degrees, but be worried that your GCSEs aren't good enough (or spell that badly)?
That aside, if you have a steady job, go and do a PPL. That will tell you whether you have a real passion and aptitude for flying. If you do, get on with the ATPL writtens and the CPL course, then start looking for jobs once you're qualified to take them.
It'll take longer, but won't jeapordise your families income, and at 24 you're barely out of school, so age is irrelevant for another 10 years.
G