Unsure if mature hairline or actual balding

[manwhart]

Hey, I am 21 years old and recently noticed that there are sort of small "paths" of no going rather far back my temples. It could just always have been like this and I just noticed it since it s only visible when i actually lift up my hair in a certain way, thats why I also dont really have any old photos to check if it was always like that.

There are some pictures enclosed, it would be awesome if you could give your opinion on that. Thanks in advance