It is normal for beards to grow quickly at this age. If you think it doesn’t look good, just shave it off. It will grow even if you don’t shave it. I have grown a beard before, but it only grows to a certain length. It should vary from person to person.
Personally, I think it’s an illusion to say that it grows faster after scraping it off. I can only say that it looks like a jump when it grows out, and the growth rate is about the same