Can't Orgasm From Sex

Deanna
Hi everyone! So the only time I can have an orgasm is when using my vibrator (Joplin V-12, AWESOME). I've come close to the big O while having sex only a few times and it never actually happens. I've tried stopping with "me time" (upwards of six months) and that also hasn't helped. I'm not sure what to do or if there's something wrong. Sex with my current (and past) boyfriend has been really awesome so I'm not sure why I can't get there. If anyone has any tips please let me know what they are! I've considered bringing a bullet vibrator into the bedroom but I don't want my man to think I can't have that special moment from HIM.
Thanks! :)