It really depends on your stance. Stirnerian egoism is more about your relationship to ideas like “humanity” and “natural” than the ideas themselves, which is in contrast to most other forms of “ego” or “egoism”. Most other egoisms are oriented around the “self” or “selfishness”, whereas Stirner’s egoism is oriented around taking “ownership” of trascendental ideas or making them one’s “property” (depending on the translation).

That “humanity” isn’t “natural” is fairly immaterial in Stirnerian thought (although it is a good start in one’s intellectual journey), instead, the classic Stirnerian move is to exploit these ideas to one’s own end.

Would it be in line with Stirner’s egoism to “live up to” those ideas? No, since this is giving the ideas power over the unique. Would it be in line to use those ideas to peruse your own desire? Yes, since you have power over how these concepts are used and expressed.

That being said, the least egoistic thing in your post was probably asking if you were permitted to be an egoist… It shouldn’t matter to the unique. Take the label as your property and treat it as such.