Just to put things in perspective - you will be taking on the equivalent of a mortgage. Given that you will have to live somewhere as well, you will be paying that twice over before you start eating.
I know you're keen, but you will have to learn to be patient when you start flying, so you may as well start now!
Having said all that, it isn't impossible - I'm sure with the right motivation you will get there - just don't lose sight of it in those dark hours. I would suggest however that you can fly aeroplanes and still have fun without being in the airlines. Firebombing, etc. I lost count of the big jet pilots who used to come and admire the DHC2 (Beaver) I was flying and wished they were still flying one.
Good luck