Congrats! You'll be so proud when you complete your first Metric Century! I agree with the others, that the shorts are too big.

If you really like Shebeest, then go for it, otherwise, I highly recommend Terry Bella shorts! There's NOTHING negative I can say about those shorts. I have tried so many different ones, and these are my only shorts that I'll ride with. The reasoning is the pad does not move, and the lining goes down much further on my leg, so I don't really get that "bunching up in my crotch" problem. I use little chamios cream, and I never had to reapply for my last two long rides (95 miles/90 miles). I use it just for preventative sake. It does give a slight sausage look, but because these shorts are LONG 8.5") it covers up pretty much my thigh and slightly compressive so it doesn't "jiggle". True to size too!

Wish you best of LUCK!!