2011 Jeep Grand Cherokee Laredo 4 wheel drive

So i bought my car in June and yesterday was my first time driving it in
snow. I felt like I had no control whatsoever and that i was never in 4 wheel
drive. i have no knob or anything to manually put it in 4 wheel and was told
that it will "automatically" go into it when needed. I've had jeeps prior to this
one with 4 wheel capability so i know what it feels like when its in 4 wheel
drive and i never got that feeling while skidding around yesterday. I called
my dealership today and asked them about it and they said it should always
be in All wheel drive but i felt like i was in 2 wheel drive the whole time. Also
on the back of my jeep is a "4X4" sign , so shouldnt that mean i have 4
wheel drive capability. Im bringing to dealership in the morning but wanted to
post on here and see if anyone had any comment about this. Thank you.