“C” sounds

“C” sounds I have been having trouble saying hard C words, like collision, calling, etc. it is a block at the beginning and no sounds come out. This is frustrating for me because the sound doesn’t even involve your lips or tongue really. It’s just in your throat I guess so cant really use the light contact of articulators since there aren’t any involved in the sound and I am not sure of any tricks to try to overcome this