Can’t tell if I’m fat or if I’m average. Help!!

Bell

Please don’t judge!! So I’m 13, 5’4”, and 150 pounds. My dad used to call me chubby and he and my stepmom keep trying to get me to do this diet thing, I do agree that I should get in better shape but I have scoliosis (back probs) and it makes it hard to exercise a lot. My doctor tried to do something but he needed to get an MRI first and my primary insurance declined it😢 The doc blamed it on my weight and sent me to a health class where they told me I was OBESE!! I tried to diet but I just ended up not eating at all and falling into depression. My mom helped me out of it but I still find it hard to eat more than a granola bar a day and I’ve barely lost any weight! My mom blamed it on my bone structure and always helps me out but she recently left for some military training camp. Is the doc right or is it just a number? Please don’t judge!! I’m really self conscious and mostly wear oversized guy hoodies to cover my stomach but I need some help do any tips?