Having knee pain after school and feet cracking a lot?

Everytime i go to school and walk around for a bit i notice that i get knee pain and soreness but its weird because i never had this problem and also when i walk my feet crack so much I don't know whats wrong because i dont even play sports and im not even that active for my knees to be hurting and im also pretty young im 18.

Having knee pain after school and feet cracking a lot?
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