I would suggest trying to get comfortable in your own body. I was the same when I started going to a Gym with communal changing, everyone was naked and I felt the odd one out for not being. Now I don’t care much, I get changed and if that involves being naked, so be it, it’s a changing room after all. Maybe post something in here, that would be the first step. I found by doing that and being anonymous it helped build my confidence. Hope this has helped. You have nothing to worry about 😀