Indeed it is deep. And I have an interest because I must know my faith.

The more I learn about our Faith, the more I discover I do not know; and the more my drive to know increases.
And have to be in communion. But I also seek. And hat comes from many different sources.
All Truth comes from one source, God. Jesus said “I am
the Way,
the Truth, and
the Light.” He is not one of many possible sources, He is the only source. Any Truth we find in other religions is a pale reflection of the full Truth we find in Christ through His Church.
Being in heaven is “existence” in order to exist, one must’ve been non-existent.
Incorrect. God, by his very nature, is that which
must exist. His nature is existence itself, otherwise He would not exist, and neither would we. We are contingent on God, but God is contingent on nothing. If you’re interested in learning more about this subject, Trent Horn’s book “Answering Atheism” goes into it in a very accessible way.
And both the existent and the non-existent are in suffering.
False. Those who exist
may be in suffering, it is not a guarantee. God does not suffer, nor do the angels who serve Him, or the departed souls who accepted His mercy and are in Heaven.
But all suffering is self induced.
Again, incorrect. Much suffering is self induced, true; but there are also natural sufferings, like those that accompany old age; or unnatural sufferings like those inflicted upon us by others. A child who is murdered in the womb suffers greatly, but has not inflicted this suffering on themselves nor done anything which would demand they suffer.
By misconceptions, confusions as to the way things really are. One can see torment all around in any conceivable way and not suffer. That’s hard for us to understand. Jesus himself we read suffered.
Those CCC references are kind of confusing. Is it saying Hell is a place or state? Is everything a state even a “place” ? Well those CCC quotes I need to understand.
True, Jesus did suffer. This is because He chose to take on Human form to elevate humanity. Christ’s suffering was entirely by choice. It was not self inflicted, but rather inflicted upon Him by other. He did it because He loves us and wanted us to understand the depth of that love.
Hell is a state of being. We envision it as a place because we are physical creatures and that’s really the only way we have to understand things. In reality, Hell is a state of being which is the complete and total separation from God’s presence. For now, that state is purely spiritual, and we do not really know about how the separation between those who are in Heaven and those who are in Hell is handled; that is a reality we simply cannot comprehend because we cannot comprehend of existence without a sense of place. It’s a limitation of out human intellects. After the resurrection, however, Hell will take on the reality of both a state of being, and a physical place. We know this from the Book of Revelation, wherein the souls of the damned, reunited with their physical bodies, are cast into the lake of fire. Since our bodies are physical, they require “place” to exist in; so at that time a “place” of Hell will be created in the new existence as a continuation of the spiritual “state” of Hell which exists now.
I’d like to stress that this is my personal understanding from my study, and while I believe it is supported by the Church’s teachings on the subject, my knowledge is not comprehensive, and so I might be misrepresenting something here unintentionally. I hope what I’ve said makes sense, and is helpful to you.