Your parents want you to have some way of supporting yourself and your young wife when you get married. Reasonable enough. What are the alternatives-
You reject your parents advice and get married without a means of support. Doesn’t seem like a good idea to me, or a good way to start a marriage, but people have done that.
Date women who are able to support you and are committed to supporting you while you are in college and/or learning. I could be wrong, but those women might not be interested in dating a 20 year old, since they’re probably a little older, i.e., they’ve worked in a job that provides a decent enough salary to support a family and know they can keep doing it.
Win the lottery.
Be such a gem that a wealthy father in law says I just have to have you for my daughter and will support you indefinitely.