8:55 for a mile is completely reasonable. If you're new to running/haven't ran in a very long time then it's going to be hard the first few times especially on the legs as you're using some muscles that you wouldn't normally use in a certain way. If you think you're going too fast then ease off a little bit and slow down your pace until you can do the distance comfortably without feeling drained, then try and edge up the pace/distance a little.
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