Picky 1 year old

I need some help. My girl has always been super picky. She’s 20 months old now and tantrums are in full swing. She barely drinks anything. Most of the time barely touched any meals I make her. All she will eat is fries, chicken fries, popsicles sometimes (homemade with fruit and coconut water), snack bars, watermelon, and sometimes pizza. She will throw fits over food. It ends up on the ground or pushed away. She’ll growl or yell if I give her anything else. I’m so stressed about it. I keep hearing that she’ll eat if she’s hungry but it’s beyond that. Her pediatrician has been having me give her a couple of ounces of pediasure mixed with milk. She loves that. But I really want her to have a more balanced diet and have a good relationship with food.