According to our current understanding of physics, it is not possible for an object with mass, such as a human being, to travel at the speed of light. The theory of special relativity, proposed by Albert Einstein, tells us that as an object with mass approaches the speed of light, its energy and momentum increase dramatically, making it more and more difficult to accelerate further.
Additionally, as an object with mass accelerates, its mass effectively increases, and the amount of energy required to accelerate it further also increases. This means that it would require an infinite amount of energy to accelerate an object with mass to the speed of light. Thus, it is not physically achievable for a massive object to reach or exceed the speed of light.
Moreover, time dilation and length contraction occur as an object approaches the speed of light, which would have significant consequences for an object traveling at such speeds. Time would appear to slow down for the object relative to an observer at rest, and lengths in the direction of motion would contract. This would result in strange effects and distortions that are not experienced in our everyday lives.
In summary, while it's interesting to speculate about what might happen if we could travel at the speed of light, our current understanding of physics suggests that it is not possible for objects with mass, like humans, to achieve or exceed the speed of light.