How much is too much!

How many times do you masturbate. I do like every other day sometimes multiples times a day. Sometimes I use my hand but most of the time I use my vibrating rabbit ears for clitoral stimulation. I've heard people say that doing so makes you insensitive to actually getting stimulated during sex, is it true? I never have been able to orgasm during sex and the fist time I ever experienced orgasm was with using a vibrator