Trouble trying to orgasm

Hello, i could really use some advice, i'll take any i can get. For whatever reason it is extremely hard for me to orgasm. I have never been able to orgasm from sex, from being fingered or even from being eaten out. I get wet to some extent but not even close to having a orgasm. Recently i bought a vibartor to see if i could maybe on my own. A handful of times every now and then have I been able to actually orgasm and only one time it has actually felt mind blowing. everytime i use the bullet vibarator i can't seem to always orgasm. does anyone have any tips or tricks? I've tried a couple of different vibratiors and the only one that has actually made me orgasm a couple times is the bullet vibarator and even then it doesn't always make me, I could sit there for hours at a time and not feel a single thing. any advice? thanks!