We were discussing this in this topic: Feeling Crystals?
I think it helps to do some sort of work with the crystal to get used to it. Hold it, meditate and breathe in its energy, even if you don’t feel anything.
Other examples: put them in places where you will see them, draw them, give them names, carry them with you, do a grounding exercise or a crystal attunement.
To me, it’s about “sharing experiences” with the crystals so that you get to know them and create a bond (kind of like a friend).