You owe it to yourself, your family, and future generations to exist in images. Stop hiding. Quit focusing on your flaws and put yourself out there for your family. You will find out a few things.
They think you are beautiful.
They love you.
Everyone will have fun.
You will enjoy the experience, the pampering, and the creativity.
Don't worry about posing and camera angles. That's my job. All you need to do is relax and enjoy the ride.