abbey - Some people are simply not meant to drive cars.
For a variety of reasons, the mental faculties needed to absorb the processes are not in place, and cannot be put in place.
That means that, for a small minority, driving is simply not for them.
An experienced instructor will know within a few lessons if a pupil is going to be able to learn to Test level, or not, and should advise accordingly.
This may be what your instructor is saying to you - I don't know that, obviously, but if I were you, I would ask him for his reasons for his observation.
If what I have outlined is his reason, then you can either accept what he says, or try with another instructor and see what happens.
It's equally true that some instructors and pupils do not gel at all.
I had two lessons bought for my seventeenth birthday with a driving school, and I disliked the instructor from the first moment we met.
I abandoned him, my dad taught me, and I passed first time.
So clearly this needs a little investigation.
It's no use asking your parents if they think you should continue, they don't know, and can't know if you are suitable as a pupil.
Have a chat with your instructor, and you can proceed from there based on what he tells you.
Good luck, I hope it works out for you.