My prefix uses a force.
My suffix is feeling certain.
My infix is a legal force.
I make you feel uncertain.
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I think the answer is
Pressure
My prefix uses a force.
Press
My suffix is feeling certain.
Sure
My infix is a legal force.
Su sounds like "sue"
I make you feel uncertain.
Pressure can mean the use of persuasion or intimidation to make someone do something.