Just do it - strike out in a new direction. You'll be glad you did.
In my time I have come across blokes who dragged their butts into the same warehouse for 35 years before getting their clock; blokes who plodded on in a job that had lost its appeal many years before, just ticking off the days until the pension kicked in. And, of course, I have also worked with jerks who have wormed their way to "success" with all sorts of nefarious tactics.
But for me, it has always been about being true to oneself; and I recommend that same mind-set to everyone. In 1983 I wrote "know what you want from life, and if what you want is within your reach, take it and be content". I still reckon that's a good maxim.