No, the pyramids were not created before humans existed. The construction of the Egyptian pyramids occurred during the time of ancient Egyptian civilization, which started around 3100 BCE (Before Common Era) with the unification of Upper and Lower Egypt under the rule of King Menes. The oldest known pyramid, the Step Pyramid of Djoser, was built during the Third Dynasty, around 2630 BCE.
Humanity, in its various forms of Homo sapiens and related hominin species, has been around for hundreds of thousands of years. Modern humans, Homo sapiens, emerged in Africa around 200,000 years ago, and civilizations like ancient Egypt developed much later in human history.
The construction of the pyramids was a remarkable achievement of ancient engineering and architecture, and they were built as tombs for Egyptian pharaohs and their families. The great pyramids, such as the ones at Giza (Khufu, Khafre, and Menkaure), were constructed during the Old Kingdom period of ancient Egypt, roughly between 2600 BCE and 2500 BCE. These structures were built by skilled human labor using massive stone blocks and advanced knowledge of mathematics and engineering available during that time.