I think the majority of people don't handle junctions and roundabouts at first. Lucky for me I'm a natural at foot controls, hardly stalled at all in my initial lessons and picked up all of the manoeuvres really quickly, but when it came to junctions and roundabouts I was still making mistakes after my 30th hour. But after a total of 35 hours of lessons and 2 test fails, I passed with just 1 minor. The point I'm making is, don't dwell on how well you think you're progressing. You might feel like you're just not picking something up, but one day it'll just click in and become automatic to you. If you have a good instructor, they'll notice that a particular thing needs work and will work on it until you get it. That will be later on in your lessons of course.