Einstein's theory of general relativity, as currently understood, does not allow for time travel into one's own past. According to the theory, spacetime is curved by the presence of mass and energy, and the curvature determines the motion of objects within it.
In the context of general relativity, there are solutions to Einstein's equations that describe spacetimes with closed timelike curves (CTCs), which are paths that loop back on themselves in a way that could potentially allow for time travel into the past. However, these solutions involve highly exotic and hypothetical conditions, such as the presence of infinitely long rotating cylinders or the manipulation of wormholes.
The existence and feasibility of CTCs within our universe are still topics of active scientific debate. One of the main issues with CTCs is that they can lead to logical paradoxes, such as the famous "grandfather paradox" where a time traveler could go back in time and prevent their own existence. Resolving these paradoxes and understanding the true nature of time travel, if it is possible at all, requires a deeper understanding of the fundamental laws of physics, including a potential theory of quantum gravity that unifies general relativity and quantum mechanics.
At present, there is no scientific evidence or consensus on the practicality or feasibility of time travel into one's own past. It remains primarily within the realm of science fiction.