It has already been said above but if you really want to pursue the dream of becoming a commercial pilot you will need to get a stable job with plenty of hours and lots of chance for progression. Work hard, get a second job if necessary, sacrifice your nights out and holidays and budget every single penny you spend.
That is the way every other pilot from a low income background has got their training done, even if it takes several years. We've all been there, and we know how hard it is, but there's no easy ride
My first flight was in 2002, I started saving in 2006 and I passed my CPL this year. So yes, it will take you a while and it will be a bit rubbish at times, but stick at it and do everything you can to involve yourself in aviation in the meantime. PPL, helping at the local flying school, reading every book you can.
Keep at it - it's worth it in the end (despite what some others might say!)