Quote History Carrying a gun implies a mindset which you need to adopt post haste.
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Mindset, mindset, mindset......training, training, training.....practice, practice, practice!!
I expect, and may be wrong, that you've been legally qualified by the state of IL to carry legally, but may not have been mentally and physically prepared to live as a person who goes armed on a daily basis.
Experience carrying will help, but get some good training that includes the mental side of self defense and being prepared for a violent encounter.....
In addition to "hands on" live fire training on gun handling and accuracy, you might want to read books by Jeff Cooper, Mas Ayoob, Ed Lovette, Dave Spaulding and/or Dave Grossman. If it ever comes back into print, read Tom Givens' "Fighting Smarter."
Another good book is "Facing Violence" by Rory Miller.....
Carrying a gun doesn't make you safe......carrying a gun, knowing how and when to use it, and being willing to use it, may save your life.
Good luck and stay safe....
George