Getting married too young?

During my second term at college I was in a class with a late 20's early 30's divorced woman.  Apparently her marriage wasn't a joyous union and thus ended in divorce which made her very bitter.  When she found out I was 18 and engaged you would have thought I killed someone.  The look of bitterness just filled her face.  She proceeded to tell me how crazy I was to throw my life away for "some random guy".  Random guy?  Let's see...I've known Kent since I was about 7.  We grew up in church together and first were friends and then we became girlfriend, boyfriend.  And then after almost 4 years of that we were engaged.  Yet he is just some random guy.  She then told me that getting married at 18 was way too young and I should get my education first and live a little.  What's the point?  When you know that this is the person you want to marry...what's the point in waiting?  By this point she was mad at me for whatever reason and told me that I would never finish my course of study after getting married.  That as soon as I said I do I would come back to campus and drop out.  This discussion went on for weeks...it ended only because we went on Spring Break...which is when I got married.  I came back to class that first day...placed my books on my desk and told her that I was back from my honeymoon all refreshed and ready to learn.  She told me it wouldn't last through the first year.  After that term I never saw this lady again.  But if she happens to be reading this...I did finish school with a degree and ahem...we will be married TWO years this March.