According to our current understanding of physics based on Einstein's theory of relativity, it is not possible for an object with mass to travel at the speed of light. The theory of relativity states that as an object with mass approaches the speed of light, its mass would effectively become infinite, requiring an infinite amount of energy to accelerate it further. This is known as relativistic mass increase.
However, let's consider a hypothetical scenario where you could travel at the speed of light throughout your life. In this scenario, a few things would occur:
Time dilation: One of the fundamental principles of relativity is that time dilation occurs as an object approaches the speed of light. As you travel at the speed of light, time would appear to stand still from your perspective. This means that while you would experience time normally, from an external observer's perspective, your entire life would appear to happen instantaneously.
Length contraction: Another consequence of traveling at the speed of light is length contraction. Objects in the direction of your motion would appear to shrink in the direction of your travel. This means that distances along your path would be compressed. From your perspective, the universe would appear contracted in the direction of your motion.
Energy requirements: As mentioned earlier, to accelerate an object with mass to the speed of light would require an infinite amount of energy. So, the scenario of being born already traveling at the speed of light is not physically possible.
It's important to note that these concepts are based on our current understanding of physics and the theory of relativity. However, they are purely theoretical, as no object with mass has been observed to travel at the speed of light.