Why are so many people in their 20s taking so long to grow up?

[When Doves Cry]

I actually wanted to grow up really fast!
While I was in college, I was already thinking about marriage & kids & jobs.. I wanted to get out of college ASAP! But now that I am, I kind of want to go back. Though at the same time, I want to move forward.
The only thing holding me back is a low paying (although full-time) job so I can't afford to NOT live with my parents. I have $32,000 of school loans to pay back. Plus, my boyfriend is going into his 5th Year of college and doesn't want to get married until he's a year or 2 into his future job or med school. So I am STUCK. I can't force him to propose! Life is unfair sometimes.