How do I know God is aware of me personally?
God is aware of each person individually because Christ upholds all things by the word of His power. He knows and controls every single celestial body in the vast universe, keeping them in orbit. If He sustains and knows every star, He is certainly aware of every individual.
Les explains that the same Christ who is the image of the invisible God and Creator of all things is also the sustainer of the universe. Hebrews 1:3 says He upholds all things by the word of His power. Les asks why the billions of celestial bodies do not crash into one another or drop out of orbit, and answers that Christ has them all under control. Then he applies it directly: how do we know God is aware of every one of us as an individual? Because He knows every single celestial body. Since Christ's control extends to every star, it extends to each person.
Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;