The speed of light is indeed a fundamental and constant value in our universe, and it can be difficult to comprehend how photons achieve this speed as soon as they are created. However, this behavior is a consequence of the nature of light and the fundamental principles of physics.
According to Einstein's theory of relativity, specifically the special theory of relativity, the speed of light in a vacuum is an absolute speed limit in the universe. This means that all massless particles, such as photons, must travel at this speed and cannot accelerate or decelerate.
When a photon is created, it is not accurate to think of it as starting from rest and then accelerating to the speed of light. Instead, the speed of light is an inherent property of photons. As soon as a photon is generated, it propagates through space at the speed of light without needing any time to accelerate. This behavior is a fundamental aspect of how the universe works.
It's important to note that the behavior of light and other particles at such high speeds is not intuitive based on our everyday experiences. However, numerous experiments and observations have consistently confirmed the constancy of the speed of light, supporting the theory of relativity.