I do not interpret Scripture. Scripture interpret's Scripture when needed. Otherwise, God says what He plainly means. As for 2 Pt 1:20 you have quoted, Peter is telling us that Scripture is of God and NOT any personal interpretation by the one who penned it for God. How do we know this? Simply read the whole context......"Knowing this first, that no prophecy of the scripture is of any private interpretation. For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost." Has nothing to do with needing help to interpret what was written.
You sure do. You always seem to come up with a version that is at odds with orthodoxy. For example, you do not believe in calling the various actions that occur in the Scriptures "sacraments".