There are several things that cause someone to rush into marriage. First because of family finances. A poor family if having an adult daughter will usually be married when someone is applying. This is done by parents because he is financially difficult to finance the family.
Secondly because of coercion of parents. Parents who have an only child usually want their children to marry soon. They are afraid of losing offspring. Third because they like each other, so they do not want to part again. Fourth because the habit of a region (culture). For women who are past adolescence are considered unsold, this is a disgrace for the family. Therefore, parents hasten to marry their children if there is a proposed.