Ummm. OP... could you and me... perhaps... swap bodies, locations and horses? You are gorgeous, don't listen to people who try to tell you otherwise. Your horse is stunning. And you and your horse are such a lovely talented pair. I agree with the critiques given [for the most part] and just wanted to say I'm super impressed at your maturity. I would have snapped. But always remember, smile at people who try to insult you. Thank them, even. Nothing irritates them more!
Edit; this is by the way coming from a very petite rider who has also been told to lose weight - I just laughed, if I was any lighter I'd be underweight. The equestrian world can be incredibly shallow.