Don't worry too much. Whilst learning to fly, I had a landing crisis as well. I was almost desperate, told my main instructor that I simply couldn't figure it out. Then, suddenly, some hours later, out of the blue, it all clicked. We're strange animals in the way we learn things, both mentally and physically.
But, for God's sake, get yourself one or two good instructors to fly with. Tell the school that current arrangement isn't working and is against all professional good practices. Once you've got the landings sorted, you can probably fly with anyone for the rest of the course.