Welcome to CDH. The people here are wonderful and totally non-judgemental. I bet you’ll fit in. I often felt the same as you and there’s a bunch of tricks like wearing long sleeves, angling your body for the camera, wearing a belt slightly higher than your actual waist to make a fake one. Finally there’s like eighty bajillion shapers out there that might help.
Just be open about it and be yourself and I am sure you’ll have a wonderful time discovering these things! hope you enjoy your stay here and get many wonderful pieces of advice.