You can never be alone when you are aware of yourself as a spirit.
The concept of alone relates to the physical. A body can be alone. A mind can be alone, but when you are aware of yourself spiritually you are part of the spiritual universe - a universe of spirits. There is no energy in the spiritual universe, no space nor any separation. Therefore there is no alone.
Alone relates to isolation, which is a physical concept.
Even if you never saw another person, you would never be alone if you’d befriended the human spirit. You could be in the middle of a jungle and you’d be so interested in the wonderful other life forms surrounding you in the game of life, that you could never be lonely.
Loneliness is just a denial of the human spirit.