Rose, I think it's great and bold of you to have seen this for yourself, this thought, "I am useless" that you've been carrying around and believing as if it were The Truth.
A few thoughts on what you've said. Being Harmony may or may not be your purpose in life, but what it certainly is is an inspiring possibility, a way of being that when you generate it, it inspires you (or has, at at any rate), and assists you in letting go of old pain -- old habitual negative thought patterns. Inspiring possibility and life purpose are not necessarily the same thing. You can generate as many inspiring possibilities as you want to -- there is no limit! I do my process often and have generated hundreds of inspiring possibilities for myself. It's not about being flaky or indecisive; it's about being who you want to be in each moment, and recognizing when your old pain is running you so that you can be free to choose something that works better, if you want to.
About life purpose: it's an elective. You
choose your life purpose. It's not like it's something that exists and is discovered objectively, like a diamond in a long-lost mine that is waiting for you to find it. Plus, you don't have to choose a life purpose; most people never do. It's a choice. No one can tell you what your life purpose is or isn't; if someone tries, it would be worthwhile for him to take a bold look at why he's doing it. I imagine K is trying to be supportive and loving, but underneath that, it sounds like he is being attached to something, and withholding freedom from himself -- and projecting that constriction onto you, because you are his partner, so he can see it outside the bones of his own head. It's a great learning process.
You might want to gently and lovingly ask him to consider that he might benefit from looking boldly at who his advice is truly aimed at.
You are drawn to lots of different things because you are an interesting and interested person, Rose. You are a grand student of life, and there's no need for you to specialize if you're not inspired to. Part of your purpose in life might be to learn as much and as many different things as you can -- that would certainly inspire me! It's so moving that you are so utterly committed to making a difference in the world for others, and I believe that your insatiable thirst for knowledge and varied experience is one of the ways you build your foundation for doing so. It's possible to make a difference in the world from a stand of stillness (or even ignorance or inexperience), but it looks to me like part of how you make a difference in the world is simply by being the incredibly inspiring Life Warrior that I see in front of me. You battle to remove limitations on yourself, and by doing that, you fight for the world. That makes a huge difference for all of us!
The fact that what K said makes you angry is wonderful. You know that is access to something deep and powerful for yourself. I know you will look for ways of expressing that anger, like talking to us here, rather than filling your Temple with foods that don't contribute to your well-being and power.
(that reminds me -- Tim Freke, one of the speakers at ICDI in Vegas, said, "my body used to be my temple, but now it's more like a night club."
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Finally, I think that you are absolutely brilliant to be creating these situations for yourself in which people are telling you who you are or who you should be. It looks to me like it's the perfect working-through of your old "duty" pain -- it occurs to me that "making a difference" itself might be occurring for you like a duty, rather than as an inspiration or joy. Is that worth looking at? I also wonder if you are creating all this to unfold for yourself the ability to see the magnificence of you who you are right now -- sometimes I want to shake you and get it through your thick skull what an incredible human being you are, not potentially, but actually. I think you get glimpses of it, but then you deny it. And now may be your time to awaken to the limitless glory of who you are now.
None of this is a compliment to you, Rose. It's a challenge.