This is an interesting article: https://www.bostonglobe.com/metro/2015/03/16/suicide-rate-mit-higher-than-national-average/1aGWr7lRjiEyhoD1WIT78I/story.html
Cornell, as are a lot of other top universities, can be stressful. My D is a Jr there now, and, while admits to academic stress at times, loves it. Great time management skills are very helpful. Good luck!