Sorry to hear about your pain bubbles. The most I can really say is that you're not alone, I'm in a similar situation, depressed, no friends, moody especially with my mum (I'm living back home and am actually 24 so this isn't right behaviour).
I think I agree with flagwriter, it might be worth looking into a different antidepressant. I'm in the same situation actually, I think mine have bad side effects on me... I just didn't want to 'bother' changing them and experimenting with lots of different ones.
Try to reach out to your therapist a little, if you can.
I think your dad has your best interests in mind when he says he thinks you can't cope with uni. But only YOU know that. It doesn't mean you're not capable of the work, but stress is... a ******. Remember though that university can keep in mind if you're suffering with depression and things. I dropped out of uni due to stress BUT looking back I realise there were special circumstances I could have got, like deadline extensions, lots of things.
Hope you begin to feel a bit better x