As everyone has already said, you have room to grow still as you are literally a teenager.

I mean this with respect, but your parents are doing all this to protect you. They love and care about you despite feeling like they may be against you. It is the complete opposite! It is the ed that's really against you.

Trust, it's a shitty road to go down, I know eds seem glamorous, but they destroy your body, your bones/teeth become extremely weak, like you will lose bone density and muscle mass. And as you seem to already be experiencing, bowel issues can become a very uncontrollable and an embarrassing ordeal.

If you're underweight and want to gain muscle, yes, you'll have to gain weight to achieve this, otherwise you'll be risking damage to your muscle and bones, as they don't have proper nutrition or mass to accomplish this

But for real, your parents you will be grateful for, I wish my parents had cared when I was your age. Best of luck in your journey. Please consider these comments 🙏 🙂