Am I thinning?

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Hi guys, I'm 21, and lately I've decided to grow my hair out a bit.

However, as I've done so, I feel like my hair became... thinner than usual. I sadly have no idea if this is due to balding or just because long hair naturally appears thinner since it weighs more, so I've decided to let the experts of reddits decide my fate.

Here are same pics :

Hair parted in the middle : https://imgur.com/a/LLvTbYM / https://imgur.com/a/P6kEWHM

And here is combed forward : https://imgur.com/a/6ryvlcQ / https://imgur.com/a/ytV95M2