This is a beautiful piece! I loved reading about your special place, and the magic there. Below I've recommended some grammar and punctuation changes. I hope you find it helpful.
Over the metal door,
Do you mean beyond the metal door? (Is it above the door, or on the other side of the door?)
A cold breeze of negative ten degrees Celsius
where I put my load down
It was all low, in height, and warm, which allowed me to observe the stars comfortably, but there were some shortcomings
As I headed toward the uncomfortable, cold, high places, the view became better and pleasurable .
If you'd like to replace "pleasurable," perhaps try saying: "The view became better and more pleasant."
the place was uneasy than ever before.
Your meaning here could be clarified. Perhaps try: "I felt uneasy."
very end of the discomfortmy comfort zone[quote=jeon][quote=jeon]leave my bright 23 degrees dormitory room
You could simplify this sentence by saying, "my bright, warm dormitory room." Or, if you want to keep the degrees, spell it out completely ("my bright, twenty-three degrees dormitory room").