I also have a very small and well-hidden clit; you can't see it unless you really dig around and pull apart my labia, and even then you have to really know what you're looking for (and having a magnifying glass probably wouldn't hurt either, haha). Even when I'm super turned on and it's as aroused as it's ever going to get, it still doesn't stick out of my labial folds at all. And I don't have huge labia, either. I guess I just have petite ladyparts, haha. You're definitely not defective!

When I'm turned on, my clit gets pretty sensitive, so I don't usually have a whole lot of trouble stimulating it....but I do enjoy precise clitoral stimulation, and it can sometimes be a bit chellenging to really pinpoint my little stealth-clit. I often find it helpful to pull apart the folds of my labia with one hand to expose my clitoris, and then position the vibe directly on it with the other hand. Once the vibe is in place, I can let go of my labia and free up that hand for other things.

I've never tried using a pump, though it sounds like a perfectly logical suggestion. Have you tried using different vibes with different qualities of vibrations? If you've only tried more buzzy vibes, you might try for something with deeper and more rumbly vibrations. Or if you've only tried more rombly vibes, you might try something more buzzy. I've noticed that my clit responds best to a certain type of vibration (in my case, it's somewhere between rumbly and buzzy that seems to work the best, but everyone's different). You might also consider looking into some sort of clit toy with suction and/or air pulsation, if you haven't tried that. My clit loves air pulsation toys. The Satisfyer brand makes some great (and very affordable) options.