HELP REALLY BAD JAW PAIN!?

I am 14, sometimes when I open my jaw it to s sideways, and I got really bad jaw pain. My parents don't believe me, it has been happening for hours. My parents won't take me to get it looked at. What could it be? Is it dangerous?
Update: *sideways
Update 2: I meant it goes sideways, I don't do it on purpose
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