According to our current understanding of physics, traveling faster than the speed of light is not possible for various reasons. One of the fundamental principles that arises from the theory of special relativity is that nothing with mass can reach or exceed the speed of light in a vacuum.
One consequence of this principle is that as an object with mass approaches the speed of light, its energy and momentum increase dramatically. This implies that it would require an infinite amount of energy to accelerate an object with mass to the speed of light. Therefore, from a practical standpoint, it is currently considered impossible for anything with mass to achieve or exceed the speed of light.
As for the hypothetical scenario you mentioned, where an object is somehow traveling faster than light, it leads to several paradoxical situations. One of these is the "tachyonic antitelephone" scenario, where information appears to be sent back in time. However, such scenarios are considered to violate causality, which is a fundamental principle in physics that events occur in a particular order and cause precedes effect.
The consequences of faster-than-light travel, such as being "stuck traveling at lightspeed behind reality," are still speculative and not fully understood. There are several proposed theories, such as time dilation and causality violations, but they remain in the realm of speculative physics and require further research and investigation.
It is essential to note that our understanding of the universe continues to evolve as new discoveries and insights emerge. While faster-than-light travel remains purely speculative based on our current knowledge, it is always possible that future advancements could challenge or refine our understanding of these concepts.