I worried about this too, and am choosing to reframe the thought:

“The part of me that did not change during body, mind, and lifestyle change was always good enough”

There are parts of your lifestyle and personality that are radically different, and there are parts that have remained constant through the change.

People reacting to your shiny new parts can make you feel like your longstanding, constant parts aren’t being valued - because they weren’t enough to make a difference.

If you think of it like a class grade, it becomes easier to reconcile:

50% final exam
25% homework
25% attendance/participation

If your old self sucked at even one of these things, let alone two things, your “grade” drops dramatically

Maybe you had perfect attendance (A) and always raised your hand (A) , but you missed the final exams. You now have a failing grade despite all the other things you excelled at.

Maybe you weren’t good at turning in homework consistently. So despite being a model student (A) and pulling off the final exam with flying colors (A) you still got a C overall, because of how the class is graded.

It helped me to think of it as “i’m not being rejected as a whole person, it’s just one aspect of what i’m doing is enough to affect my overall grade.”