Do not wear shorts unless you want massive chafing on the inside of your legs.
And don't worry about padding your butt. It's your groin that's going to hurt and no amount of padding is going to help that. Only time in the saddle, that gets your groin muscles to stretch that way, will prevent that pain.
Are you male or female ?
The saddle bums are very nice for a man under other pants. They prevent rubbing and protect the inside of your thighs from the seam in jeans. They have a bit of tail bone padding and hold your privates up tight like and athletic support. THey are a bit warm in that area in the summer. I wore mine under baseball pants before it got hot.