Majority of women cannot orgasm from penetration alone, only about 25% can. You need to focus more on clitoral stimulation during foreplay and sex. You can also try stimulating your g-spot that's just a bit inside the vagina, either via fingering, toys or certain sex positions (helps if your partner's penis is curved).
Try not to lie about your pleasure to your partner, they want and seem to care that you also reach climax. You need to teach them, show them what makes you cum. It takes time and effort, but it can be an amazing experience for both of you.