I think we have all experienced that kind of fear, despite if you've loved aviation since you were a kid.
Starting the PPL means, starting to deal with a small aircraft and realising how much stuff you have to do do, keep in mind and deal with at the same time.
Once you keep learning and getting your hands on your fear will just become a normal cockpit workload and if you keep training that workload will become "easy" to manage and finally it will be just pure joy!.
My suggestion is just, keep training, do not rush, you do not have to fly solo in the 12th hour, you will fly solo whenever you are ready, and by that time, you will already be enjoying flying.
Keep flying!