In order for cycling shorts to do their job, they're supposed to fit like a 'second skin', not have 'crotch room'.
The job of cycling shorts is as follows:
o Wick sweat away from your skin to the surface of the fabric, so it can be evaporated away
o Prevent chafing as much as possible where your body contacts the saddle
They can't do those things if it's not skintight or if there's 'crotch room'.
They should be skintight but not cutting off circulation. You may have just got too small a size.
Now, based on your complaints, I also have to question whether your saddle is the correct size, shape, or style, and if it's adjusted correctly for you specifically.
If the saddle is too large, you'll sit too far forward on it, placing too much pressure on the wrong points of your body.
If the saddle is too small, you'll be carrying your weight on your perineum (your 'gooch'/'taint') instead of your ischial tuberosities ('sit bones').
If the saddle fore/aft adjustment is wrong, you may end up sitting on the wrong part of the saddle.
If the saddle is not properly leveled or the height is misadjusted, you may have pressure on the wrong part of your body.
If your thighs are large, the saddle *shape* may be wrong for you, leading you to sit too far forward on it, which also would place pressure on the wrong part of your body (I personally learned this the hard way).
If the saddle is one of those heavily padded with gel, you will have more contact area between the saddle and your crotch, which after not very long riding becomes uncomfortable due to *chafing*; more padding does not equal more comfort, as unintuitive as that may sound.
You need to go to a LBS that has a good selection of shorts and try them on first. Buying online may not be best for you.
You also need to have someone who understands bike fitting check your saddle adjustment, and that you have the right size/shape/style saddle for you specifically. You may need a different saddle entirely.