Help with background checks for guns, USA

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Does anyone know how to check your own background to see if you will be denied purchasing a gun? I'm having anxiety about going to a dealer or store and attempting to purchase only to be told I was denied when they do the background check.

I've been in the mental health system (never hospitalized) and I'm not sure of my eligibility to buy a gun.

 

[Meretlein]

You can buy a gun. Only people who have been involuntarily committed can't.

 

[?SYNTAX ERROR]

You can buy a gun. Only people who have been involuntarily committed can't.

Thank you so much for your reply.