
First of all, good luck and yes, be sure to tell us how it went!
Second -- if your friend has much sense (if she's your friend she must have plenty), she'll manage to take it as a compliment both that you worried so long about what she'd think of you if you told, and that you eventually decided you trusted her enough to tell her.
You've had major secrets
before, gone back and forth on what to tell to whom, felt uncomfortable not telling, but eventually decided that telling wouldn't be the best solution right then. What's wrong with that? You could now just as easily be regretting having said too much back then; in fact, I say that if you're determined to dump on yourself, you can dump on yourself just as easily for a good choice as for a bad one.
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FZ sez:
If you know you'll give yourself a hard time no matter what you choose, it might as well be for choosing what suits you best.