Hairs that fall out, questions!

I started losing my hair at the age of 18 in 2020, as soon as it was noticeable I decided to shave it off with a machine. But last year, in December, I decided to let it grow because I wanted to have it evaluated by a doctor, I let it grow for 4 months. And here is the thing, I realized that my hair was falling out a lot, I was probably losing between 100-200 hairs a day, every time I woke up I could easily see 30 hairs on the pillow, my hair was falling out just by pulling it or passing my hand through my head. I had the appointment and shaved it again, however, I noticed that my hair is no longer falling out and that there is no more hairs on my pillow, so my question is, is it possible for the hair to only fall out when it reaches a certain length? Or is this BS?

Normal hairs grow at a rate of 1/2 inch per month, and for a man in his early 20s, it probably would grow for between 2-3 years. These hairs can fall out if you have the genetics for hair loss. Some hairs become miniaturized, and they will not grow to their full length, shortening over time until one day these miniaturized hairs will fall out; cutting them short will not change the hair loss cycle and the loss that I discussed above; sorry to burst your bubble.