Thanks for your query.
Noted your history of pulling of the ligament or a muscle and cracking on bending the knee.
You want to know what you can do to stop this and you are 13 years old.
I would advise you the following:
First of all apply a knee cap or at least a crepe bandage to support the knee joint.
Consult an Orthopedic Surgeon for clinical evaluation and physical examination.
MRI and further treatment as advised by Him.
I hope this answers your query as you can not really do anything to stop this.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.