Do you think a self-centered person can change?

Yes, it's happened and it's documented, but it's rare. If something so huge (and often horrible) happens to them that literally makes them re-evaluate their entire life, I think it can happen; extremely unlikely otherwise, frankly. Besides that maybe at least a decade of extremely regular and well-guided therapy might help, if what they have is basically a reaction to upbringing or circumstances in early life?