Hey man, I went down that same road. I used to be a state employee as well. (Social work) I can't say one day it just hit me, but similar to you, I was sitting in my cubicle and new I couldn't do it forever.
Anyway, things are so much better now - Getting out was the best decision I ever made.
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Cheers. It was seeing and talking to people similar to yourself that really gave me that extra push to make a change.