I think you'll just have to grit your teeth, and come out with it in the beginning. Once you do it for the first time, after that it won't be so hard. Usually what we IMAGINE will happen is much worse than what actually happens.

I used to do the same thing, but once I figured out that I'm better off confessing in the beginning, it became habit. Besides, my mental health is worth it! LOL
You won't worry, fret, get panicked if you just let it out from the beginning. And you'll feel better about yourself too.
Best of luck & God bless. Hugs, Lee