Who should we fear?

I hear different movements that say that I should fear and there are times when I give in to their  fear.
They mock me and my God and raise questions that promote that I believe in a lie but I focus on the Lord.
The Lord will keep me up and he is faithful to the end.

Psalm 3

Lord, how many are my foes!
    How many rise up against me!
² Many are saying of me,
    “God will not deliver him.”

³ But you, Lord, are a shield around me,
    my glory, the One who lifts my head high.
⁴ I call out to the Lord,
    and he answers me from his holy mountain.

⁵ I lie down and sleep;
    I wake again, because the Lord sustains me.
⁶ I will not fear though tens of thousands
    assail me on every side.

⁷ Arise, Lord!
    Deliver me, my God!
Strike all my enemies on the jaw;
    break the teeth of the wicked.

⁸ From the Lord comes deliverance.
    May your blessing be on your people.

https://www.youtube.com/watch?v=q24z4XcJxnM