Anyone Else Have Trouble With the "O"?

I've never had an orgasm. Ever. I'm 18 years old, and have been sled stimulating for about 6 years and having a partner stimulate for 2 1/2. I've been self stimulated for hours, eaten out by my boyfriend for an hour, rubbed it out, had sex in multiple positions, used water jets, vibrators, toys... Nothing. Anyone else have this issue or am I just unlucky?