Shocks are not springs. I keep wondering why people think they are.

Many of them have some pressurized gas inside that means you have to press them together to install them, but it's only 5-10 pounds of force. 5-10 pounds is not going to make more than 1/16" difference in ride height.
Check it carefully with a tape measure on a perfectly flat surface. Measure from the ground straight up to the top of the wheel well opening metal lip.
If you're certain it's only the front, and only the passenger's side, and the upper strut mount and lower control arm don't seem bent, then it's a sagged spring. Many offroaders, myself included, have to replace springs every year or two because overuse or constantly banging them into the bump stops (such as a pothole could do) will eventually cause them to deform and sag.
Not always easy to replace the spring with the EXACT replacement part because GM used about a dozen different stiffnesses depending on exactly what engine, drivetrain, and options the vehicle was built with. If it's time for new front shocks, just buy two of the same kind of spring, or use Monroe Quickstruts that come with a new spring, and slap those in and don't sweat the fine tuning.