Don't dispair. My memories of our first 6 - 7 puppy classes some 5 years ago are horrendous,I used to go home with a headache. Charlie just thought it was for him to socialise, which was all good, but sit, stay,recall, heel all went over his head !!
He was much better learning at home without distractions, it all came good and here we are now with a wonderful well behaved ( well most of the time !! ) dog.
Good Luck.