Congratulations on getting airborne and getting flying - just about all of us on here know what that feeling is like..... Just wait until the 'headiness' of your first solo!!
The reflecting you are doing on what you are learning could be the most valuable thing you will ever do... it is a worthwhile habit to get into and every time you fly whether 5 hours or 500+ the habit of continual reflection, discussion and learning can make you a much safer and better pilot.
I can see you are getting to grips about just how much knowledge is required... this is what the exams are all about really... a good example of this is interpreting the weather beyond "reading the TAFs" - a good knowledge of air masses, fronts, cloud formation and being able to read the synoptic charts will give you a much better ability to plan well and fly safely than a quick scan of a few TAFs will ever tell you. The same goes for all of the other exam subjects....
Good luck with the lessons and as others have said - "Welcome to the Club"
Mike