I have been experiencing pains in one leg?

i'm 14 years old, and my right leg has been aching around the knee for the past month. it hurts more after jogging or walking, and it always makes me want to stretch out my right leg. i have never had any bad injuries. is this normal?

Check this site out.Hope all is well

though its normal but i suggest u that consult the doctor and tell ur parents abt this..
nd with few medicines..u'll b alright friend.
tak cr...god bless