Can you describe precisely how God comforts you and provides companionship?
First, we need His correction which we can read about in Hebrews 12:4-11. This scripture tells precisely what happens because of God's correction.
Then, as God's correction makes us more and more real in His love, we experience His comfort while we are having compassion for other people. It is a package deal, of how we enjoy His comfort while we are ministering God's comfort to others > 2 Corinthians 1:1-4.
And we have His companionship by means of the Holy Spirit sharing God's own love with us
"in our hearts" > Romans 5:5; also see 2 Thessalonians 3:5. And this comes more and more while we are about being pleasing to our Father, by being gentle and quiet in His love >
"rather let it be the hidden person of the heart, with the incorruptible beauty of a gentle and quiet spirit, which is very precious in the sight of God." (1 Peter 3:4)
We need to be first interested in pleasing God and seeking to please God, not only to try to use Him for making us feel good.
How do you interact with God?
I be quiet and see what He does with me. And I go by what the Bible says to expect because of God living in us. The Bible is talking about how we become and live because of how our Father corrects us and changes us to become like Jesus.
One feature about Jesus is He is not conceited > even though He is so superior, He does not look down on people who are so less than He is, plus Jesus has hope for any person, at all. And He showed this by dying on the cross for any and all people > 1 John 2:2. So, in our interaction with God we find ourselves being corrected and challenged and changed to love and have hope for any and all people. There is constant exposure to how God is, in us, and this example has us also becoming more and more all-loving and gentle and kind and humble, not conceitedly looking down on anyone, but we have compassion, also > Hebrews 5:2
If I were to observe you while you interacted with God, would there be any precise feature that could distinguish your interaction from the interaction of a person with an imaginary mental construct in their head?
In order to fully enjoy God's companionship and comfort, we ourselves need to follow His example of how He is all-loving.
"For if you love those who love you, what reward have you?" (in Matthew 5:46)
Therefore, one feature of a Jesus person, versus someone make-believing a friend, could be how the Jesus person is loving any and all people, and not only trying to use Jesus for company and something to keep one's imagination busy. God is all-loving and so generously forgiving, but He expects us to follow this example
"And walk in love, as Christ also has loved us and given Himself for us, an offering and a sacrifice to God for a sweet-smelling aroma." (Ephesians 5:2)
So, God is not conceited, but willing to share with us humans who have been so selfish. But we need His correction of His love's perfection (1 John 4:17) so we can truly benefit from how He forgives and loves us. And we find this in the quietness and rest (Matthew 11:28-30) and gentleness of His love.
And so, a feature of a person successful in this is how the person does not keep giving in to anti-love things like arguing and complaining (Philippians 2:14-16). Also, the person puts away things which are not loving and deeply quiet >
"Let all bitterness, wrath, anger, clamor, and evil speaking be put away from you, with all malice." (Ephesians 4:31)
And this makes the person deeply strong so the person can love any and all people and not allow wrong people to have power to decide how the person is and what the person does. It is wise not to allow evil people to have power to decide if you are a loving and caring and forgiving person or not.