We need to know the type and purpose of this essay/paper. Is this a researched paper, in which you will cite actual information to support your views? Or will you be allowed to simply spout off opinions regardless of whether they are supported by facts? This matters. If this is to be a researched paper, then you need to do some research before writing your introduction. I suspect you will find that the combination of the economic downturn and tuition increases is to blame.
Maybe college students have experienced stress from their school assignments.
That's always been true, and thus cannot explain a change in the most recent five years.
Also, they may have also experienced hardship from maintaining their job life and school life while trying to have a personal life.
Ditto.
and college life is time consuming.
Ditto, unless you can prove that college life has somehow become more time consuming. Have professors begun to give more assignments? Have graduation requirements changed?