Gas cap wont come off

Wont even give pushing it in. Like its being sucked in by lots of pressure agaisnt the gasket. Someone else here mentioned there sgould be no pressure since i drove it days ago, but i ran it in the garage yesterday. Gonna try some other stuf some of you guys mentioned for tomorrow since its late now. I'll let u guys know how it went. Hopefully i dont create spark when i use my gas powered grinder on it...Lol...
This is not a pressure problem this is a devise that is not right for its application, it’s locked up and that’s that .