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I'm a freshman in highschool and I'm really not used to reading books like this.
The fact that you ARE reading things like this at your age means you'll be that much more ready when tougher reading assignments come your way. My suggestions? Read the parts you don't understand more than once...it helps, trust me! In your case, go over Goldstein's book (actually formulated by O' Brien, by the way) and reread the different parts. Look up words if you have to, reread things aloud, whatever it takes. Are the concepts in the book hard to understand? Yup. Is it worth understanding them? Definately. Put in the effort, and things will seem a lot clearer to you a lot faster. Good luck and happy reading.