You have died, and your life is hidden with Christ in God. Paul describes not a future hope but a present reality. You have died, and your true life is sheltered in Christ.
This means: what threatens you does not threaten your true life. Your core is hidden in God, unreachable for attacks. Authority in Christ is based on this hidden standing, not on visible strength.
When pressure comes today, remember: no one can touch your true life. It is sheltered in God.