My dad called me fat

I was looking at photos with my parents. I then asked them if I actually looked like that in real life. Then, like parents normally do, my mom and dad went on about how pretty I am but then my dad said something that I’ll never forget. ”You are beautiful but if you were to lose a few pounds you would be really pretty.” It might not be a big deal but I have been crying all night. I don’t want to tell my friends because deep down for some reason I care about my dad and I would feel bad if all my friends hated him. Idk if that makes any sense. Anyways, is this a normal thing to say to your 15 year old daughter?