a few things:

1. You don't want the small, you want a medium that fits better.
2. Try other brands, and buy some with more "panels." Cheaper shorts will only have like "6 panel construction" while nicer ones will have more. With more panels, they might contour to your skinny arse a little better.
3. You will change your mind about bibs soon enough....just as you probably already changed your mind about wearing those ghey shorts.