I am new f1 student got visa approved on 2014 june 13th for summer june 30th. due to short span and my health not in good condition I have deferred the classes to next semester fall 2014 aug th. My health was little better now but due to some family and health reasons I was still not ready for fall 2014 aug 30. 1.)Now can u please let me know if I break any rules of F1 ( status violation, SEVIS termination). But for sure I should be able to attend it for spring 2015 jan 25. 2.) Can i differ admission and use same f1 visa? 3.) If i inform DSO, will she cancel my i20 ? 4.) does it affect my future in any way ?