I love my pendulums, personally. What exactly guides them depends on who you ask. For me, I think it's a combination of my subconscious intuitive mind, and possibly also my spirit guides giving me a little nudge
But that's just me.
I've had some really good results with the pendulum. I posted a story not too long ago in this forum about using a pendulum (a necklace, actually, since I didn't have a "real" pendulum with me at the time) to figure out if a package I was waiting for would finally arrive that day. The necklace/pendulum said yes, I would. I got home, checked the mailbox, no package. But sure enough, later that night as I was looking for something else in the house, I found the package in my dining room. It had arrived a week prior but my roommate stashed it out of sight by mistake. The pendulum was right and I did receive my package that night.
Why not open a thread here in this forum to experiment with your pendulum? Maybe if you're not asking personal questions about yourself, ones that you have no opinion on, you'll start to gain more faith in your readings. Ask your sitters to ask one question they know the answer to (Is my hair brown?), so you'll know if you're right or wrong. You can also ask them to ask one question they don't know the answer to, just for fun, and see how it goes.
Good luck!