The shadow appearing is not uncommon given your age. The same thing happened to me when I was 18, from hair that was visible but easily shaved and no shadow, to the hair coarsening and the shadow appearing

At first I didn't understand why the shadow was there either; they never told us much about hair and puberty in health class in high school, other than one will have facial hair and other new hair along the way. They never warned us in late puberty the facial hair could turn thick and dense so fast. I was taken totally by surprise

Other males your age with your ethnic background probably also have shadows. Your facial hair is probably quite "normal", just look around. I know for a long time I thought I was the only one until I started to notice heavy shadows on others.
Your facial hair will not revert or get any better with age, nothing short of female hormones will slow or reduce it and even then the hair will still be there just not as heavy. Your hair may continue to thicken and get more dense, and the shadow may continue to get worse. It may not be related to the plucking. There is hair under the skin you can't pluck out, so you will still have some shadow anyway. Plus you may be left with redness and irritation. I know, I tried plucking to remove the shadow too, it didn't work.
However, if you are considering laser or electrolysis, stop plucking now. You will make permanent removal more difficult. I used to pluck out my facial hair, I know it is hard to completely stop.