I mean everyone has been through the same, modelling is somethimes harder then it seems. It’s really about taking care of yourself, believing in yourself and being at your best (shape, hair, skin)!
No matter what people tell you to do if you don’t feel comfortable with it you shouldnt do it.
I believe that everything happens for a reason so if it doesnt work out it will next time. Also when you pose it’s not about the poses you see on magazines and billboards etc, a picture is made out of the moment itself! Be playful with the camera, have fun and give them movements that they’ve never seen before. Nobody wants you to be copying someone else, the more originial you are the better!
So no stress because you are always better then you think and you can always push yourself further than you think.