When I was struggling badly in the pre-solo phase, an instructor mentioned that one of the frustrating things about the experience was the lack of any frame of reference. As mentioned above, despite all of the briefing and instruction you can still feel unsure as to how it is supposed to look and feel. Meanwhile it's easy to feel as though you are the one thicko in the world who cannot do what everyone else at the airfield (even that numptoid propping up the bar) seems able to do. In the past your mates could ride their bikes, or swim, or skate-board, or hill-start their cars, or whatever it was that you just couldn't do, but then one day you could.
If you can, take FFF'S advice and book a few days off to concentrate on flying. That worked for me as well. A good few dual circuit sorties, say 40 mins to 1 hr, with plenty of pauses for coffee and reflection in between, and the next thing you know you'll be experiencing a previously unprecedented rate of climb, glancing over at that seat beside you and noticing that all it's got in it is a map and a headset. Good luck.