How to stop swearing and such?

I have just heard a recording of myself and I did not realise how much I sound like a scumbag, swearing as much as I do. It does not sound right, I am a respectable teenager girl and I should not be saying such things. I was brought up in a family where swearing is accepted as proper vocabulary, I don't believe this but I didn't know that I swore that much! How can I stop it, I would also like to know how to stop using such phrases like "Oh my God", because I am religious I don't like this, I just seem to say it all of the time, please help me stop :)
Thank you in advance and God bless you all.

Something my great-grandfather repeatedly said to me that I now find myself saying to my children is: "Only speak if someone else will benefit from your words."

Some interesting things that I've noticed by *trying* to do that are:
1) People usually pay attention to what I say because they assume I'm about to say something important.
2) I probably don't say as much stupid stuff as I would otherwise.
3) It helps me keep my mouth shut, and that helps me stay out of messes.
4) I hurt others less.

Any time you speak without thinking about what you're going to say, you have a good chance of wishing you had used other words later on. You just have to make up your mind on who's in charge, your brain or your mouth. :-)

"All kinds of animals, birds, reptiles and creatures of the sea are being tamed and have been tamed by man, but no man can tame the tounge. It is a restless evil, full of deadly poison." James 3, 7-8. what helped me with this is somthing skyDancer said. Make other words in place of swear words. make yourself aware. God be with you.

Try to be around people who do not.
When you do not hear those words all the time, you should not use them.

If you do make a mitsake, note you did and learn next time to no do it.

What I do is make up substitutes when speaking. I say, 'What the bowser?' and 'Son of a Swan!' but even this would be considered swearing anyhow. What I do when reading swear words is think 'meep!' instead. F word=meep! Hope this helps! Also, I would train myself not to swear. Avoid the temptations, Giggles! AVOID THE TEMPTATIONS!