Have you EVER had an orgasm? If you haven't, you should work on that first. Most women orgasm from clitoral stimulation. So, applying pressure on your clitoris will help. Therefore, oral sex is one of the best ways to have an orgasm.
One thing that I've learned the hard way is to not worry about it so much. I know he wants to please you, but the two of your should focus on how good it feels for both of you. Not necessarily orgasm....but, you know when you just
enjoy it? Just have fun. There can be a lot of fights and tears that can erupt from focusing on something that a partner can just not achieve right now.
"You and your issues"? Don't worry about it! Lots of women can't orgasm from sex alone. You are not in the minority, ok? And if he's going to leave you becuase of something like this...well then, his loss. Like I said, this is pretty normal to have difficulty orgasming from sex.
My advice: just enjoy sex without having an "end goal." Have fun...and if you haven't orgasmed at all, have lots and lots of oral sex.