My clit, I get horny easily but then I can't finger myself, why not?

Maybe too much stim. If what you mean is you can not achieve an orgasm by direct manipulation of your clit, you may have a hooded clitoris, or you may be getting over stimulated. Too much stimulation can cause you to get somewhat numb as you get close to a climax, and then you can't get any more stimulation to finish. Try saving clitoral stimulation until you are very near having an orgasm. And ask your family doc.