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Yes, your time is very good. Females are generally faster than males. I am not in shape at all, and am 28 years old. I did a mile in 12 minutes. The girls in my class that were your age were doing about what you are now...and the teacher said they were doing well.
You feel strange because you over excerted yourself. Get some rest. It will go away soon.
You check your pressure by finding your pulse either on your wrist or your jugular vein, and watching the clock. When you desire to start counting,,,have a predetermined stopping point for the second-hand. Let's say 30 seconds.
How many times did you feel your pulse in 30 seconds? Multiply by two. That will give you beats per minute.
Of course, if you count by fifteen seconds, then multiply by four.
And after running, it is better to have another person take your count...as a rested person would get it more accurate than you after you have just run a mile.
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