No, if you point at a random point in the sky, you are not guaranteed to hit a star. While there are indeed a vast number of stars in the universe, space is incredibly vast as well, and the stars are distributed over vast distances. When you look up at the night sky, you see only a fraction of the stars visible from Earth, and the rest remain obscured by factors such as light pollution and atmospheric effects.
Even in the darkest and clearest skies, the density of visible stars may appear high, but there are still vast regions without any stars visible to the naked eye. The stars are spread out across the galaxy, and there are significant gaps between them.
Moreover, when observing the sky, the vast majority of the stars you see are those in our own Milky Way galaxy. The universe contains billions of galaxies, each hosting billions or even trillions of stars, but they are distributed across immense distances, making it highly unlikely that a random point in the sky would correspond to a specific star.
However, it's worth noting that when observing a random point in the sky using powerful telescopes, especially those that can observe in different wavelengths of light, the chances of encountering a star or other celestial object increase significantly. Telescopes allow us to observe much deeper into space and uncover distant objects that are not visible to the naked eye.