I hardly used the "F" like you I thought it one of the most deplorable words in the English language, or any other language for that matter.
After my life went to hell....oh I used all kinds of other cuss words all my life much to my Mother's chagrin she reasoned that since our Dad cussed like a sailor how was she able to stop us kids but she did always correct us! So back to the story....after learning of my X's affair and the whole bamshuckled ordeal dealing with the Elders and all, I started using the F work a lot....still do, although I do speak proper out of respect of others most of the time.
My husband even sometimes blushes when I get going and he's a big strapping construction worker! LOL I ain't ashamed of nuttin! I honestly chalk it up to holding things in so much when I was a JW that it's a release for me to just say what I darn well mean to say and some words, well sometimes you only need that one word that says it all.