The perception that we always see the same stars in the sky is a result of the vast distances between stars and the relatively small scale of human observations. While it is true that the Sun, Earth, and the rest of the Solar System are in motion within the Milky Way galaxy, these motions are relatively slow and do not cause drastic changes in our view of the stars.
The Milky Way galaxy is a vast collection of billions of stars, and from our vantage point within it, we see a specific portion of the galaxy's stars as our "night sky." The stars we see are generally at distances measured in light-years, which means it takes light many years to travel from those stars to us. Due to these enormous distances, the apparent positions of stars in the sky change very slowly over human timescales.
As the Earth orbits the Sun, the positions of the stars appear to shift slightly throughout the year due to the changing perspective from our moving vantage point. This phenomenon is known as stellar parallax, but the shifts are very small and require precise measurements to detect. Over longer timescales, tens of thousands of years or more, the slowly changing positions of stars can be observed, but within a human lifetime, the constellations and patterns of stars remain largely unchanged.
It's worth noting that while we see the same stars in the sky, their positions do change over very long timescales due to the motion of stars within the galaxy. Additionally, stars that are closer to us may exhibit noticeable proper motion, which is their apparent motion across the sky over relatively short periods of time. However, these motions are still relatively slow and do not significantly alter the overall appearance of the night sky as observed by humans.