Texas Castle Doctrine Extends To Any Place You Are Legally Allowed To Be

(E) A person Who Has a Right to Be Present at the rent Where the force IS Used, Who Has not Provoked the Person Against Whom the force IS Used, and Who Is Not Engaged in Criminal Activity At The Time The force IS Used is Not required to retreat Before using force as Described by this section.
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Is this Saying if I Have a Right to Be Covered somewhere I am "under the castle doctrine? If so, Does This assumes you Are Allowed to Be Carrying a concealed weapon to defend yourself? Then What Is The Point Of The CHL in Texas?

Thanks for clearing this up.