I can't orgasm

1) Have your primary care physician refer you to a gynecologist. Hasn't got anything to do with sex; you're an adult person with a vagina, so you should have one.
2) Consider your environment. Do you need to keep quiet? Are you tired? Pressed for time? Worried about school or work? Worried about getting pregnant (see #1, above, and ask about safe and effective birth control- there are lots of choices these days)? Concerned about getting the sheets dirty? A lot of these can be fixed, like putting down a towel or finding a way to make time.
3) Consider positions. There are some (cowgirl, reverse cowgirl, some forms of doggy style) that put more pressure on the clitoris and may be better for orgasming.
4) Consider accessories like toys, lube, etc. They may help.
5) Consider foreplay. Maybe you should be doing more of it. It's okay if you orgasm during foreplay and not penetration. Which leads me to....

Lots and lots of women don't orgasm during penetration alone. There's nothing weird or shameful or wrong about this. It's reality. Work closely with your partner and be open to suggestions and variety. Both of you should be, anyway. Being able to change, grow, and listen to (and act on) feedback are all vital for healthy relationships, and not just in the bedroom.

Your boyfriend is being dismissive of your concerns. He’s selfish. Any mature man knows how to be good in bed . That means paying attention to your partner.

Insist on a “ me first” nite. That means until YOU have a happy ending, he doesn’t get to enter the “magic kingdom.”

No matter how long it takes. You first.

To me, masturbation is way more easier to have my orgasm than sex. I believe this is true for many women.

Try to get yourself a simple vibrator, the small one that can stimulate your clitoris. Find a late evening where you are alone and convenient. Relax yourself and try with the vibrator. The key is that, don't force yourself into orgasm. Keep in mind that, as long as you enjoy the sensation, get yourself wet and arouse, take as long as you can explore yourself.

Try the above and I believe you should have your big O very soon. The main point is, relax and enjoy, orgasm or not doesn't matter.