Worry not. This is meant to happen. Repeat after me "success is 99% failure" x 100.
I learned to drive in secret and put myself under enormous pressure in doing so [brain of a squashed maggot]. I frequently felt like I hadn't a clue what I was doing. It all felt too much to think about what my hands had to do, then my feet, whilst simultaneously paying attention to what was happening on the road. Stop. Start. Stop. Start.
If I am being thoroughly honest then I only really became a confident driver a year or so after passing my test.
It will all gel beautifully eventually and you really will get to a stage where you don't even have to think about it, it will come naturally.
This is a really important time.
To be a good driver, now is the time to make heaps of mistakes so that you really understand why not to do certain things. Ultimately, struggling with bits of driving, roundabouts, crossroads, parallel parking etc is good! Don't run away from these things, get your instructor to do nothing but that for half of each lesson until you know it like the back of your hand.
Don't feel embarrassed or under pressure. You are paying for this. You deserve to go over and over and over it until you burst with pride at getting it.
Remember, everyone was a learner once.
Remember, getting it wrong will help you get it right.