Are you talking about, "The 7 Habits of Highly Effective People" by Stephen R. Covey...
If so, I have not read the one for teens... but I believe that at age 20 you should get all the guidance necessary in the "People" book...
Covey's work is about principles... and principles are the same whether you are fifteen of fifty... and it is not a complicated book to understand... so I would get it if I were you... best twenty or so bucks you'll ever spend...
Best of luck to you...
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