OK, my .02, I am usually more patient and tactful, so pleas forgive my bruntnes...
You have an 8mos old high drive working line GSD.. What would you expect with an 8mos old kid?!!! This is a dog that will mature much faster then a child/baby, but they are still an entity with thoughts, opinions, feelings, energy, emotions etc... To assume crating while you work with a daily fun time would work is akin to thinking the 8mos old baby will eat once, poop once, and maybe cry once.... Not going to happen!
You need to acknowledge that you brought another existential being into your home. You decided you would take responsibility for it, which is awesome, as long as you acknowledge that your life has changed... It will be time before the dog matures and learns routines and grows a bond with you... It takes effort your part to teach, PLAY, lots of exercise and mental stimulation to a growing intelligent being, and yes, take time out of your day... Does it suck? For a time, yes... Is it worth it? Only you can answer that.. From personal opinions, YES, ABSOLUTELY! This dog will. Give EVERYTHING EVERY OUNCE OF ITSELF TO YOU! For little more then food and occasionally good play... But as a pup in its needy mode it requires you to adjust, to sacrifice, to find a way to play it out before you work.
Now, best and fastest way to do that is nose work... Playing ball is physical but not mental.. Nose work is both and a 20min session can do what an hour of ball or 2hrs of walking can do... But that does not mean the pup is done for the day... You may have to do 3x sessions a day of 20min breaks, alternating obedience and or ball/tug.. As you do this your pup will learn patterns and what is expected, it will play energy out, and have the mental stumulus it needs to become what it is predestined to be.. It will form a bond and willingly sacrifice its comfort FOR YOU! BUT YOU NEED TO EARN THAT FIRST!