Early on it is natural to think about food all the time, I worry about what I am going to eat for lunch and dinner and how I am going to plan it and what I have in the house etc etc. Its like anything new, obsessing about whether you are eating the right things, enough, too much....just read through the forums, its all there.
Primal isn't a 'one size fits all' and I think you'll see that in the forums also, you do need to listen to your body, but in the first weeks your body can lie because it is addicted and craves things that aren't necessarily good for it. However once into the groove, if you fancy an orange have one, if you want cheese - have it!
You say eating isn't 'fun', I would guess this is because you are young and you don't know how to combine the foods you can eat to make wonderful, satisfying and delicious food. As a mum I have been cooking for over 20 years and I have always cooked from fresh so adopting the primal lifestyle isn't too difficult for me. However I think you probably need to invest a little time and energy into finding some recipes or dishes that you truly love. Marks readers cookbook has some goodies in it.
As mmsantos said, just focus on avoiding the bad stuff and it will come good.
Perseverance is not a long race; it is many short races one after the other.
I am a horse for a single harness, not cut out for tandem or teamwork; for well I know that in order to attain any definite goal, it is imperative that one person do the thinking and the commanding. Albert Einstein