Like Architect, I spent years "fitting in" as my introvertedness was generally an unacceptable thing in my family (my mother's influence mainly ESTJ). I was forced into situations I generally would have avoided like the plague, and it actually made everything worse. I became more and more insecure and introverted as a result of being hammered all the time with the usual: "stop being so shy, there's nothing to be scared of!"...and: "you're just like your father!". Father is ISTP, I think.
I was pretty much told that all things abstract and slightly arty were bullshit, and to get a profession that would sustain me financially. (I was arty and inclined towards the more abstract things like philosophy, absurd and provocative literature and other "rebellious" directions in politics, religion, science....basically anything that would shake my mother's cemented views on the world).
So I conformed as I was convinced that it was me that was weird.
Picked the most unlikely profession and kept going until it nearly killed me. The money was good, I had status and all the rest....but I was going insane.
Basically played a role of ESFJ for years, just to please my surrounds. Or mostly, it turns out...my mother.
I finally tore myself away and stopped.
Just stopped everything I was doing. Applied for uni, got in....and here I am, doing what I always wanted to do. I rarely speak to my family anymore. They think I'm this bum. No money, no security, still single, childless.....
I do not care.
What did it do for me?
Architect's analogy is good. The bodybuilder. I have some impressive other-function muscles I can flex.....but it takes some effort.
Personally, I wish I had never changed. It was an "experience". Whether that experience did more good than anything is a different question I cannot yet answer.