Lots of people confuse running or jogging with sprinting. It would be incredibly hard to sprint an entire 5k, but if you are new to running, you may have never understood how to run without sprinting. Try this...
Stand still and just run in place for a minute. (Or 30 seconds). Focus on not lifting your feet too much off the ground, and hitting your foot evenly each time. You should NOT be pounding....it should be a soft tap, tap, tap. Try to focus on slowing down this way before you move on to actually really running. See if it helps.
Also, when I begin a 5k, I always remember two things....1- I should be able to breathe through my nose. If you are huffing and puffing, you are going tooooo fast. 2- it should feel way too easy (like I will usually have the temptation to go faster). Maybe it is easy at first but by the end of the 3.1 miles, it certainly feels different from how it did at the beginning.
Another tip is to shorten your stride. Maybe this is just me, but I often find that when I am getting tired, it is feels easier to take smaller running steps, even if I compensate by going just a bit faster, for some reason it still FEELS easier to shorten your stride and go faster than to take long, bounding running steps which will tire you out much more. But in your situation you might also try shortening your stride without going faster at first.
"The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it." Michelangelo
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