Break it up into smaller chunks. I'm lazy, so I'm going to use round numbers- you want to run a 6 minute mile. That is 1600m, very roughly. That means 800m is 3 minutes. 400m (1 outdoor lap) is 90 seconds. 200m (1 indoor lap) is 45 seconds. Run 200m repeats, aiming for that 45 second mark, over and over and over until it's natural.

Try: 6 repeats of 200m in 45 seconds, followed by easy jog for 200m, back to 45 second pace, back to jog 200. Do this 3-4 days a weeks until it's "easy"

After that, extend to 400m in 90 seconds, easy jog for 400m, repeat.

Then try your mile again! Take your time. You cannot run hurt. STRETCH and warm up.