I don't really feel like my abs are being worked while squatting/deadlifting - what am I doing wrong?

By that I mean, I don't really "feel" my abs after squatting/deadlifting... they aren't sore, and also, while performing the exercise, I don't feel them being stimulated (there is no intense feeling... or really any feeling...)

What part of my form is most likely off? I'll try to upload a video after the gym tomorrow, but if I can't, I'd appreciate some opinions.