Why can't I read and "interpret" what I read in the Bible?

Why has it been taught that I can’t read and “interpret” what I read in the bible?? In the Second Letter of Peter Ch 1 V. 20 it says no prophecy of scripture that is a matter of personal interpretation. I’m not trying to “prophesize”, I’m trying to understand what I read and apply it in my daily life. I have been told I need a priest to interpret what I read because I personally don’t have the authority to comprehend. Please explain. Thank you!!

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Recommended Reading:

*]Where does Scripture caution against private interpretation?
*] What Do Catholics Think of the Bible?
*] Should the Bible be taken literally?
*] Were the authors of Scripture infallible or did they have free will?
*] Interpreting Scripture

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