When I was a child, in the 90's, I went with my family on hollydays in eastern Spain, a place on the coast, Mediterranean sea.

I remember that I usually went diving alone, in an area where there were submerged rocks, with many algae and fish of all kinds.

One day I found this in the background. I didn't care at the time, but years have passed, and I've been redpilled with mysteries of lost civilizations, Atlantis and lots more theories.
It is a rock (a fossil perhaps?) about 12 cm long, 6.5 cm at its widest point and around 2 cm high.

details:

-At the top there are some tiny marks, similar to dots, arranged on a regular basis (honestly it costs a lot not to think of any fabric made, like clothing, the pattern seems to correspond to the arrangement of the threads) photo 1

-the 'sole' is slightly convex with regular raised grooves. photo 2

-In the peripheral area of the sole, a change in the texture is observed, with which fibers appear horizontal. photos 3, 4, 5


Honestly what do you think it is ?? I don't know what to do, I want to know what I have in hands.

I think it may be some kind of fossil, but of course, to make a fossil it takes millions of years, and in theory the human being did not even exist... homo floresiensis/ hobbit civilization?
maybe its an sculpture (maybe greek, roman, minoan?) or maybe a fucking mussel fossil?? my head is burning out!

please help!