Perhaps your rounds need a bit of group counselling or at least introducing them to each other before expecting them to socialize. You probably take them to the range in a box with separators and a cover that keeps them in the dark, then you put them in the rifle one at a time.
For bullets to feel part of a group, they need to be formally introduced on the shooting bench, then rolled around together in your hands until they're comfortable and properly introduced to each other and want to be together on target. Touching bullet noses together in a group hug really helps the process of breaking the ice.
When you shoot a group, fire fairly fast, so the bullets can feel the warm tunnel of air left by it's friend, allowing it to "sniff" it's way to a tight group.
If groups don't improve by introduction and group hugs, further counseling may be required. If that fails, the only alternative is time-outs. Beating is not an option, as it may be hazardous to your health.
(Hope this little bit of humor helps. You got some really good advice by others, now put it to use and relax when you shoot. Like s-x, it's more enjoyable that way.)