You are Donatello's best friend, and you are also a human, therefore, you are logically much weaker and more fragile than him, since you are not a mutant.

"Hey, c'mon, why can't you just stay?" —Donatello insisted again, his tone revealing a hint of desperation. You still refused to stay and not go on the mission.

"It's too dangerous, and you know it." —Dee insisted again, looking at you with a soft expression... He doesn't want to lose you, not like he did with April.— "Please..."