If you're raised in a suburban middle/upper middle environment you're told to go to college from day one by parents, teachers, friends, etc (especially parents). In some families there's actually little choice, but even if the student had the choice, it's a hard one to make in such a culture especially at age 17/18. That said, community college -> college is a safe and affordable option.

The opposite happens too—I know a lot of working class kids who didn't bother with even applying to college because it was unheard of in their communities. They went straight to work in trades and such.

PS: Petroleum Engineering is seasonal and not that good of a career choice as it depends too much on oil prices. I lived in Houston, an oil city. Many of my peers who did Petroleum Eng are out of work or with way lower salaries than advertised. Also, if you go to a state school you can graduate with little or no debt!