If your config is exactly the same, then it's just personal preference. Pro players adjust their sensitivity after some time as well. Every time your muscle memory gets used to new sens, you don't feel the difference from the previous sens anymore and your mind tells you it feels too slow. When I was younger, I played on slower sensitivity, then 9 years later it's already up by around 25% as I cba moving my mouse so much anymore. I have similar feeling to you but it's opposite - I feel like mine is too fast but whenever I try to lower it, I feel like a bot cause all my muscle memory is gone.
ELSO's post in So, Sensitivity.... was marked as the answer