You don't always have to have gone through some traumatic experience to be depressed. Any kind of person can suffer from depression. It sounds like medication might help get you out of your daze and feel something rather it be happiness or sadness at least it would be something, that sounds like what you want. One way of looking at it is that perhaps your so depressed that your body is shutting itself down to feelings as a way of survival. Isolating can make this worse. Try talking to a therapist. I know it's intimidating. I was depressed in college too. It was not a good time, I didn't party or get drunk or date. I did have a suicide attempt but I didn't tell anyone till years after. I finally saw a psychiatrist in 2008 at age 22. I was petrified talking to her. You don't have to spill your guts your fist visit. Just say that you've been feeling bad etc. you can let people in gradually. I ended up spilling my guts but there are different ways of doing it.

Am I recovered after four years of therapy? No. But without it I would be dead by now or so vegetative I mine as well be dead. It's the first step to getting better, well actually for you the second step. You have already done the first step by coming here. You want to feel better and that's big.