How about I try and convince my friends to use contraception?
That is weird. How do you feel about telling them to use contraception?
I'm not very good at telling my friends what to do indeed, but I'm brave enough to try this.
You are a good friend for wanting them to be safe, even though it may be hard on you. No one deserves an unwanted pregnancy or disease, so you are working well to keep them educated. If you don't they might have learned when it's too late.
I wonder if they'll listen to me though.
You have to at least try to get them to listen. It will be for their own good and it will help prevent future problems.