Why do I feel pulled to Heal? to Guard? etc.
There are a number of people in the Otherkin community who appear to have a magickal obligation to perform a task. We call this magickal obligation a "Calling". Callings are not limited to the Otherkin community; many people in various professions feel the urge or pull to perform their duty or profession, and it doesn't necessarily imply any magickal or psi ability on their part.
It's common amongst Otherkin to find Called Healers, Called Guardians and so forth. The community doesn't claim to understand it yet, but there's many similarities in the sense of obligation, even if what they feel obliged to do is different from person-to-person or type-to-type. Feeling the pull doesn't necessarily automatically imply having the skill or abilities needed to fulfill the obligation, which is sometimes a source of frustration for some newly awakening Otherkin.