Getting married in college

Should my girlfriend and I get married before I graduate from university? We're both mature Christians and we've both made a commitment to sexual purity before marriage. We've been dating about five months, and after much prayer, we've decided to get married in two years. Our parents approve of our plans, but mine disagree about the timing. I am nineteen years old and in my first year of studies, and they think we should wait until I finish my degree. My parents have always been strict and controlling, and I feel that this is basically an issue of their personal preference. What do you think?