Best thing I'd recommend is, if you can, drive with your mum or dad while you're taking lessons. Feeling like you're the only one in control of the car (no instructor controls to fall back on) really makes you concentrate on your driving.
You can definitely build your confidence up, it just takes practice! After you've passed (which you will), make a point of going on the routes that make you most nervous - massive roundabouts, motorways, whatever it is. When I used to drive to work, I'd park in a bay, so I became so out of practice with parallel parking that it'd give me a panic attack if I tried and failed. I made myself go to places where there were no bays to park, so I got the hang of it again. Didn't care how much traffic I held up as I got used to parking - as long as you're always aware of your surroundings, and not going to cause an accident. Don't let other road users make you nervous about being a learner!