Thank you for the input.
Unfortunately, I'm quite sure that my hair has thinned. Although my mother had mentioned long time ago ( around 10 years old), that I had 2 or 3 cowlicks, which would mean I had a "bald spot" back then, my hair overall has thinned.
Back then, my hair would have no entries, not even when wet. Now, however, you can see the entries in the whole scalp. Besides, my classmates had mentioned this to me, at first they said it was nothing, later on they said I was actually balding.
About traction alopecia, I'm not sure, I do keep my hair down to covering my eyes, but I'm not sure that would actually make my hair so thin.
One thing to note is that, my hair now seems to be quite thick and rough (individually) but lacks volume. Back then, they used to be softer and finer, but had them in greater amounts.
I think my hair is becoming akin to my father's, he's got curly and thick hair, whereas my mother has finer and softer hair.
Last thing I would like to mention is, perhaps it's not only related to my scalp.
I used to have thick body hair. I used to be naive and was bothered by it, so I shaved my arms and part of my leg (just a little square). My arms' hair regrew, but where nowhere as thick as they used to be, my leg's hair only grew around one or two hairs where there should be more than 10, now it is a bald spot.
I'm Taiwanese btw, just pointing it out since Western cuisine and Taiwanese cuisine are pretty different, perhaps it's a nutritional problem. I've always eaten the same foods over and over, and hair loss began at 12, so it might not be the cause.
Again, if anyone could give me some advice, it is most appreciated.
PS. I live in a rural area where specialists aren't many or just do not exist. I might have to go to the city and make an appointment, but I don't think I'll be able to for some months.
So, I would like to at least get some recommendations about ways to prevent further hair loss until then.