Clitoral stimulation?

When I masturbate, I use my fingers to rub my clit in circles. I have good and hard orgasms, but I never have anything come out of me. I do get wet, but I'm talking about possibly having a spot on my sheets or something. I've also used an electric toothbrush before, and that was a different story. I'd have fluid pour out of me. I know the stimulation was a lot stronger, but why can't I have that with me just rubbing my clit? My boyfriend tells me he wishes that I'd get really wet, but I don't. It makes me feel bummed out sometimes like I don't do good enough. I don't mean for this to sound stupid or ridiculous, just asking.