My brother told me I was being selfish for not listening to advice and keep eating sugar. How am I being selfish?

My doctor got on my butt that I wasn't following the diet and excercise plan. She got in my face and scolded that I have type one DIABETIES. That broke me down bug time. My aunt YELLED at me big time for not listening and lying. She could see through my lies and called me out for being lazy and I don't give a shit about myself. She bluntly said, "No you're NOT doing a good job. You're doing a lousy job. All you care about is stuffing yourself with junk rather than excericing and eating healthy. You're lazy. You're lazy with trying new foods and making excuses. Now you have DIABETIES! I told, but this is what happens when you don't listen! You don't wanna hear the hard truth. DIABETIES is no joke. You do ever care! You DONT. I tried to help but you ignored my advice. I'm DONE!" She stormed off crying. My older brother said, "Can't you see you're hurting her? You're hurting all of us. We tried to help and you're not looking after your help. Stop lying to us! Your selfishness is killing you and don't care to see that you're hurting yourself. It's nobody's fault but yours. You're selfish. The past hurts sometimes but that doesn't mean you need to stop living your life and killing yourself!"
I'm not selfish! Is he right?
My aunt really made me feel bad and uncomfortable and she said it in front of my dad, brother and two cousins and neighbor. She embarrassed me. She didn't apologize for hurting my feelings.

I'm hurt because my mom abandoned is and that's why I stuff myself.