The boundary between our solar system and interstellar space is not precisely defined and can vary depending on how it is defined. However, a commonly accepted boundary is the heliopause. The heliopause is the point where the solar wind from our Sun slows down and merges with the interstellar medium, the matter and energy that exists between stars.
The heliopause is estimated to be located at a distance of about 120 astronomical units (AU) from the Sun. One astronomical unit is the average distance between the Earth and the Sun, which is about 93 million miles or 150 million kilometers. So, the heliopause is roughly 120 times farther from the Sun than the Earth.
In terms of human space exploration, the farthest distance humans have traveled from Earth is during the Apollo missions to the Moon, which reached a maximum distance of about 0.0026 AU. The Voyager 1 spacecraft, launched in 1977, is currently the farthest human-made object from Earth and crossed the heliopause in 2012, reaching interstellar space. Voyager 1 was about 14 billion miles (23 billion kilometers) from Earth, or roughly 150 AU.
Therefore, humans have not yet traveled far enough to reach interstellar space. The distances involved in interstellar travel are immense, and it would require significantly advanced technologies and long-duration space missions to venture beyond the boundaries of our solar system.