If it is a personality disorder it perhaps can be changed but it's not easy, plus expensive.

People frequently develop personality disorders as ways of dealing with trauma and unloving families and then we're stuck with them. That's what it sounds like to me, that your true self does care but you have inhibitions and defenses to prevent or avoid you getting hurt by people you care about, which is definitely a good reason to be like that, I think. Sad that it happened, maybe, but you were and are doing the best you can.