One thing that might make you feel better is to know that people like to be pleasured in their own unique ways. Men and women, large or small, we all have our little quirks and what works for one won't work for another.
You can bring this up in a way that avoids mentioning your pubic mound, or any negativity, in a few ways. The more subtle way would be to react positively when your partner stimulates you in a way you like. You know, lots of mmm's and "that feels so good" etc. However, expecting our partners to mind read is not the best plan and can delay your receiving pleasure. Instead of saying "This doesn't work for me" or "My pubic mound is covering my clit" etc, approach it in a positive way. For example:
"Mmmm it feels really teasy when you grind on me, it is building me up, but I need your fingers/tongue etc to push me over"
"That's making me so hot I need to touch my clit"
You want to try and get the message across that it feels damn good, but its just not the right stimulation in the right place for YOU and trust me, there are many smaller women who could not get off from grinding alone. Its just about personal taste. For example, I am size 12 to 14 and m clit is exposed by parting my legs slightly. However, I actually PREFER to keep my legs closed and feel his fingers on my labia majora only, which can take me to orgasm easily. So, despite having a different looking vulva, I sometimes like the opposite of you (indirect stimulation).
Manyyyy women have "buried" clitoris'. Like...I am smaller than you and as mentioned, my clitoris is exposed when I open my legs, but I still always have to pull back on my pubic mound to pull the clitoral hood up and expose my clitoris. Sometimes I want direct stimulation, sometimes it is too intense and I want my legs closed and no direct contact at all.
Anyway, the point is...while your vulva may be fuller due to being larger or having children (like many, many of us), its not unusual or different and lots of us have specific needs (left side of the clit, right side, direct on the tip, fast and hard, slow, soft etc) - so please don't be afraid to speak up and tell your partner what you need. I can bet you that s/he is extremely attracted to your vulva just the way it is and knew you were curvy before s/he even got you naked. s/he chose you because to him/her, you are stunning. It's not easy to get past body issues, esp with new partners, but they are in bed with you having orgasms - that's how hot they find you! So...go get yours! :D