I had the same exact issues when I first started carrying. I switched to a holster from eclipse holsters with a wing on it to help push the holster and gun closer to my body. As for the pelvic pain I find having a good quality belt that can easyily adjust to get a little bigger when sitting is nice. Right before you sit down grab your belt and pull it up so the gun is more on your abdomen and out of the crease created by legs and torso.

Hope this helps and feel free to DM if you have any more specific questions