Is this normal?

Ever since I was 9/10 every time I bend/extend or move my knees in any way they crack/pop *loud*. When I’m sitting/laying I will have to purposely pop them every now and then or they will be in pain. But it’s not a constant pain and my mom has always just told me that its no big deal, so I haven’t really thought much about it until recently when a friend told me it’s not normal.

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