buddy I can understand your pain.this usually happened when i had done my graduation i can not forget those 3 years.i just discovered that i need to get over this depressing feelings so i tried to break the circul that had been created though the years.i joined some social clubs.met new people and tried to make myself comfortable with new people.though they can not replace my old buddies but it was pretty helpful to me.do yourself such things hope it will work with you.