Here comes the pee and pooh brigade. Ignore them; they find their pathetic way into every good thread. Don't let them ruin things.
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Lady Diamond, there is a prejudice against amateur singing in today's world. We might be told, "You're voice is too weak, too nasal, too soft, too husky..." Or in your case, "You have the wrong accent."

That's all brainless. There are many kinds of folk song. If you keep your eyes open, you will find some you are good at.

One hint: my voice teacher told me that it's good vowels that make a song clear to the listener. Let your 'o' be an 'o' and your 'i' be an 'i'.

As for r's, consult your conscience.