I Get Pain In The Groin On Both Sides When

I get pain in the groin on both sides when I stand up after sitting a while. It lasts only until I walk a few steps. I am assuming it's a circulation issue but wondered if I should be doing something about it. I am 74, 5' tall, female and about 30 lbs overweight. I do not exercise often. I have yo yo dieted for years and have given up, as I just don't have the will power any more. My recreation is watercolors and sewing, and I sit while doing both.