If Jesus has given me peace, why is my soul disquieted? Why do I struggle?

The peace is there and cannot be taken away.

“Peace I leave with you, My peace I give to you; not as the world gives do I give to you. Let not your heart be troubled, neither let it be afraid.”
— John 14:27

But, I have an adversary who attempts to obstruct it. So, I have to fight to overcome the obstruction by believing His Word.

“Why are you cast down, O my soul?
And why are you disquieted within me?
Hope in God;
For I shall yet praise Him,
The help of my countenance and my God.”
— Psalm 42:11

We have an adversary who is an obstructionist that incessantly tries to block God’s gifts to us.

But, we have weapons to tear down obstructions.

“For the weapons of our warfare are not carnal but mighty in God for pulling down strongholds, casting down arguments and every high thing that exalts itself against the knowledge of God, bringing every thought into captivity to the obedience of Christ”
— 2 Corinthians 10:4-5

We have to fight for what’s ours every day.