If you look around, you will notice that people now have different perspectives about marriage life. Some imagine it to be a romantic fantasy. Others head for the alter because they want to appear grown up in the eyes of others. Yet others simply want to escape a bad situation at home, or in the society. Marriage should not be a fantasy or a cure for problems.
Unrealistic expectations

Another problem that faces teenage marriage couples is when they have unrealistic or poor education about marriage. An example is Mark and Delphine. After they had divorced, they were both asked same question. They admitted that, they had very poor idea what marriage was all about.
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http://www.xhow2.com/why_most_teenage_marriages_fail.html

Marriage is life time journey that has different kinds of junction,some people jumps into marriage bus not mindig how the journey would be,not minding the junction they are heading to,not minding how rigorous it could be,not minding the stresses,not minding the pains in the journey,etc.
Many people rushes into it and they didn't go too far before they runs out,just because they are not fully prepared
Some people rushes into it and succeeds
Marriage is not a joke.........