I think it depends on the stage of life that you are in when you begin training. I was 17 years old when I started my PPL training, soloed at 17, and got my PPL at 18. To be honest, I was never nervous or had any doubt that I was ready to solo after my discovery flight. That attitude is not a good thing. I thank my lucky stars that I survived my first few years of flying (at least until I got out of college). I am not sure that most high school kids should be allowed to fly, after knowing how I was. Maybe the FAA should devise some sort of "maturity test" before allowing a 17 year old to get a PPL. I would have failed I am sure.
Fast forward to 57 years old and I believe that I have a healthy amount of "nervousness" or "anxiety" before every flight, especially in less than ideal conditions. In essence, I have become a more cautious pilot as I have gotten older.
Bottom line, in my humble opinion, if you ever get to the point that you never have ANY anxieties about flying or getting in your airplane, then maybe you need to re-think about flying that day. You don't want it to be debilitating by any means, just a healthy level of respect over what you have been trained to do and are about to embark on.
Generally, once we are in the air, the anxieties disappear to be replaced by the shear exhilaration of how lucky we are to be able to fly. Have fun and don't worry about your worrying!