I was like you also, I had a horrible mouth on me. Instead of saying I talked like a trucker, I called it talking like a trailer factory worker (my mama's phrase, since she worked in a trailer factory. When I had babies, I realized how bad it made me sound, I started replacing cuss words with food words.....like ooooh peaches! or oooooooh pickles....my kids still do this....mostly in front of me, now that they are grown, our of respect for me, but I have heard my youngest still saying, "ooooooh buttered biscuits" a few times.
You have the tools in you to change this through the fruits of the spirit, one being self control, and one being Love. The characteristics of love are: patience, kindness, being slow to anger, not keeping a record of wrongs, but relishing in what's right...the traits found in Corinthians. God made you in HIS image, His masterpiece! Walk in that, and the rest begins to fall into place. And even when you fall in this (and trust me I still fall more often than I wish, after YEARS of knowing Christ's love)....God still keeps your picture on His fridge. You can do this girl!!
Peace!