Ive been feeling really empty really and extreamly unsociable i dont really socialise that much as i have anxiety also but dont know about depression, ive been feeling quite low and not really had the courage to talk to anyone about my problems as i would normally have a breakdown, i usually like being by myself away from others, i normally have panic attacks quite often but i just cant seem to find a reason to be unhappy, could this be a sign of depression?