Sometime we are unable to understand our own emotions and feelings  and dont2know how to reavt. Its okay to be low sometime. Every individual go through mood swings some point of time. But if your mood, emotions and thoughts are causing distress for you, than you can consult a clinical psychologist who can help you in understanding the  core reason (if any) of your problems. And will help you to learn how to manage your mood and behaviour.

Hello the above description could be depressive mood disorder as you just mentioned that you feel like staying alone, low mood and your life situations such as breakup and your father's demise. Try consulting a psychiatrist or a psychologist for its diagnosis and management. Try making friends in Uni, spend time with them, involve yourself in activities you like and meditate. Also try talking to your family members daily over the phone and share your feelings and thoughts.