According to Einstein's theory of special relativity, as you approach the speed of light, time dilation occurs. Time dilation means that time appears to pass more slowly for a moving observer relative to a stationary observer. As your speed approaches the speed of light, the time dilation effect becomes more pronounced.
If you were to travel at the speed of light, time would stand still from your perspective. However, traveling at the speed of light is not possible for massive objects due to the increasing amount of energy required to accelerate as you approach the speed of light. As you approach the speed of light, your mass would increase towards infinity, making it impossible to reach or exceed the speed of light.
Nevertheless, let's consider a scenario where you were traveling at a significant fraction of the speed of light, close enough to experience noticeable time dilation but not quite reaching the speed of light. If you were to fly away from Earth at this high speed and then return ten years later according to your own onboard clocks, you would indeed have aged only 10 years.
However, from the perspective of observers on Earth, more time would have passed. Due to time dilation, the people on Earth would have experienced more than ten years passing during your absence. The exact amount of time that would have passed for them depends on your specific speed and the distance you traveled.
In summary, from your point of view traveling at high speeds, only 10 years would have passed, but from the perspective of observers on Earth, more time would have elapsed. This phenomenon is a consequence of Einstein's theory of special relativity and has been experimentally confirmed with high-velocity particles in particle accelerators.