Upset

So for like a month and a half now I started going to the gym and have actually started building muscle :))) That also has impacted the way I eat so I have changed my eating habits as well:) anyways today I was eating a sandwich with some fruit and my mother called me out saying how I don't eat the same anymore and am probably starving myself which isn't true! Her comments made me really upset to think that she thinks that of me! I know I shouldn't care what others say but I live with her and to have her think I'm not eating at all even though I eat all kinds of food in front of her is pathetic and hurt my self esteem