The problem of man is he wants to think like God. Which he cannot do. He can think only what God has revealed him through the Word of God.
When we walk for today in the word of God we are walking for tomorrow. So don’t worry about what will happen tomorrow. Cast all your anxieties in front of God.
Don’t worry about the pain if it comes early in your age. God will give the strength to overcome it. God is not going to tempt you more than you can handle.