You can become a commercial pilot one of a few ways:
1- you or your family be wealthy and pay for your training
2- go to college (pt 141) and take out nearly $200k in student loans for tuition and flight training
3- join the military and have them pay for it
4- skip college and go to ATP and take out $90k+ in loans
Short story: if you or your family are not already rich, then you need to either join the military or go in to a ton of debt.