HELP!! Masturbation / vagina

So I masturbate a lot I have only ever came twice myself.. I usually just finger my self or use a hair brush handle. I cum every time with my boyfriend when we have sex he seems to know me enough to get me to the point I pretty much orgasm almost every time with him. With myself I can’t ever seem to get myself there. Is it bad only my boyfriend can get me there? Also I’ve noticed I don’t even know much about the vagina I just know the basics like about periods and that’s it.. you could literally ask me to name parts of the vagina and all I could really tell you is the clit..

Is it really that bad that I don’t know myself or the vagina ?