lesschumras, nowadays, most people are not able to support themselves yet when they get married, and in many communities, it is accepted that the parents help out. That might not be the accepted practice in your community, but in a community where it is, there is nothing wrong with someone getting married at 17.
Keep in mind that nowadays, it can take many years until someone is earning enough to support a family, since you first have to go to school for many years and then it can take a while to build up your career.