like it or not, that Ms. Marvel, Carol, became Captain Marvel, and in the MCU they decided to introduce her directly as Captain Marvel, the problem isn’t that they chose this path, it’s that they could’ve done a much better job with the character and story
New Ms. Marvel, is a different person, obviously she’s gonna look different, and i’m assuming that with “18-year-old girl, who has never had a roll” you’re refering to the actress who got cast as Kamala/Ms. Marvel, i don’t see why this being her first role, or at least first major role, would bother you, she’s gotta start her career somewhere, correct me if i missunderstood
I still hope they won’t go down the path of total SJW nonsense and actually tell a good story with the new Ms. Marvel tv show, and i hope the actress for Ms. Marvel does a good job, and wish her all the best for what might be her break-out role :3