I can't agree more A levels are hard and theres no denying that.
I felt exactly the same as you by the end of Year 12, down and wanting to give up. Sometimes I wonder how I managed to stay on for Year 13 really.
The thing is, its best to just keep pushing on with it. I don't care who says A2's are harder, because they felt exactly the same to me really.
You will probably feel alot better after results day as well, because once you know how far you have already come then its worth putting in that extra years worth of effort.
I'm sure you have done much better than you thought as well, everyone seems to think they have done worse for some reason.