I see. Yea, the ability to know that my beliefs about scripture are true only comes with honest and humble study of the scriptures, submitting myself to the holy spirit and refraining from clinging to my own understanding or what I wish the text would mean.
I believe it's best to understand the literal interpretation and not to interpret everything literally.
Take this scripture for example:
Rev. 17:3
"Then the angel carried me away in the Spirit into a wilderness. There I saw a woman sitting on a scarlet beast that was covered with blasphemous names and had seven heads and ten horns."
I believe John literally had a vision of this woman on a beast and that this symbolizes something, but that belief is far different from believing there was literally a physical woman riding on a beast that had seven heads and ten horns. Hope that makes sense.
Anyhow, I do hope and pray that you find peace in God, keep searching with an open heart