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I think the answer to your question lies in the very problem you're having. You say you've created a character whose language is so clean it's almost comical, and you yourself feel awkward when yo...
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Source: https://writers.stackexchange.com/a/37171 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think the answer to your question lies in the very problem you're having. You say you've created a character whose language is so clean it's almost comical, and you yourself feel awkward when you write profanity, so use that to your advantage. Have the MC refuse to use profanity while the other character tease him for it. Then when something goes wrong, have those characters encourage him to swear, but he can't do it. Then, as things get even more FUBAR and he finally feels the need for profanity, make it deliberately awkward for him to do so, maybe even using it out of context. You'll find comedy there and warmth of character by exacerbating the problem you're having. Have you ever seen Frankie and Johnny with Al Pacino (not a great movie, but it's sweet) where Cora tries to get Nedda to say the word 'copulate'? It's endearing and funny. This is the kind of interaction you could use with your MC. With the other characters, their profanity will have to be natural and to that end, I would watch as many American movies as you can that score high on the profanity scale until you get a feel for what sounds natural. The Wire has insane amounts of profanity, you could start there! Good luck!!