I was 30 and working at an office when I started flying (just for myself. I had no idea I'd end up doing it for a living.) Figured I'd need the instrument, then at 250 hours I got the commercial just for something to do. Then I felt like I should use the commercial, bit the bullet and got the CFI. I started instructing part time, got the other instructor ratings, and started flying pt. 135 (all part time, while working at the office.)
So, I never had the guts to 'bite the bullet and leave,' at least in the way that someone going to work for an airline would. But one day I was offered a corporate job flying small jets. It was nervous and scary, but since I've made the move it's been just fine. The money is better than I made programming computers, and my whole outlook on life is soooo much better.
Just wanted to give another thought to you. There are options outside of the airlines.