Getting on a rocket to Mars has been a dream for space exploration enthusiasts for decades. However, there are a lot of engineering problems that still need solutions before people can safely get to Mars (and back, unless you favor the one-way trip strategy). Optimists might expect humans to walk on Mars sometime in the 2030s, but realistically, there would have to be a significant change in the way deep space exploration is funded for that to happen. If you're just entering 5th grade or so, maybe you can consider a career on Mars. But perhaps you shouldn't put all your eggs in one basket.
If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post