"Many are rising against me" - Many in stature. Many in Torah. (2 Samuel 10:18) "Shobach" - Why was he called Shobach? Because his stature was like this shobach (rod). And his name was "Shophach" (1 Chronicles 19:18) because he would shed blood.
And so too Goliath, of whom it is written (1 Samuel 17:4) "Whose height was six cubits and a span." And so too, "Many in Torah" refers to Doeg and Ahithophel. Doeg was the head of the court, as it is stated (1 Samuel 21:8) "The chiefest of the herdsmen that belonged to Saul." And Ahithophel was a counselor, as it is stated (2 Samuel 16:23) "And the counsel of Ahithophel...was as if a man inquired of the word of God."
"A man of my rank" - but it is not written "a man," for he was not a man but an angel. And so David says (Psalms 55:13) "For it is not an enemy who reproached me, then I could bear it." (Ibid. 14) "But you, a man like myself, my companion." (Ibid. 15) "We who enjoyed a friendly intimacy." This then is "Many are rising against me."