How can I possibly ever let people know about this side of me? I feel like I'm living more than one life!

You can be whoever and whatever you are at any time. Whether the person you're talking with thinks of you as human, elven, or insane doesn't change who you *are*. So, if you're an elf who loves plants and trees, you can always introduce yourself to people as a "person" (i.e., sentient being) who loves plants and trees.

Of course, if it's really important to you that people actually know that you consider yourself something non-human, then you may want to come out of the closet to them. (See below)

It's up to each individual to define their comfort level with what other people know about them. There are many people in the community who are in the closet about their Otherkinness and many others who are rather out of the Closet, and all in between. Talking to other people may help you to decide what level of revelation to others is right for you.