I CANT ORGASM!

Okay whether I am pleasuring myself or making love with my boyfriend no matter what we do I can't orgasm. I've tried vaginal, clitoral, and anal stimulation. And just to clear the water its not that I'm not turned on or feeling it I feel like I'm about to cum but there's a barrier that I'm getting stuck at and can't pass its so frustrating! I know its different for everyone but if I could get a few ideas on how to attempt to orgasm I'd be so appreciative!