You say...

"When I am truly non-resistant and focused on a desire, I can also feel the energy in me flowing."

But I think there is a word missing from that statement.

I believe it should read...

"When I am truly non-resistant and focused on a unfulfilled desire, I can also feel the energy in me flowing."

Think about the things you have already physically manifested in your life that have just become a mundane part of your everyday life.

When you think about them, do you still feel that same strength of energy flow?

I doubt it, unless there is some aspect of that thing that still feels incomplete in some way to you.

It's the incomplete and unfulfilled aspects of our lives that draw life energy through us. And ironically, it is exactly those incomplete and unfulfilled things that the majority of the world is trying to eradicate from their lives :)

Fresh new, unfulfilled desire gives us a reason to focus (to come into alignment with our broader self which has expanded to include that desire), and in that focus, we feel more alive. We experience the purpose of life, which is joy.

I've explained this idea of the thrill of unfulfilled desire a bit in Good things happen when I’m feeling negative and bad things when I’m positive - WHY??

See if that helps. If not, please let me know and I'll try to be clearer.

EDIT - FOLLOWING LIAM'S FIRST COMMENT BELOW

I think what may be causing problems for you is the limitations of the analogy/paradigm you are subscribing to.

As a convenient shorthand to discuss these ideas, people (including myself) tend to refer to creating or manifesting as though there are things that are external to ourselves that somehow need to be manoeuvred into physical existence but it's not really like that.

Take a look at Am I responsible for the Gulf Oil Spill, from a Law of Attraction perspective? for some initial thoughts about moving away from this idea.

Now, let's update the analogy/paradigm a bit to bring it a bit closer to what is really going on while bearing in mind that doing this will make it harder for us three-dimensional physically-focused consciousnesses to be able to comprehend it.

Some preliminary considerations...

• There is only one particle in the universe but it moves infinitely fast giving the illusion of a vast number of particles

• There is only one moment in time (NOW) in which this particle is moving (because it is moving infinitely fast)

• Consciousness redirects the motion of this particle into new and different forms. But there is no new matter being created...it's all about changing the path of the infinitely-fast moving particle

• Because there is only one moment in time, there is no past, present or future. They are all happening NOW and therefore your past is always changing, however your now memories of the past are also changing in a synchronized fashion so you believe the past is solid and stable. I said it was going to be hard to comprehend, didn't I? :)

• Because there is no time, there can be no cause and effect (like gradually manifesting something into existence, in the way we think of it) because that implies linear time. Instead there is continual expansion i.e. more and more intricate patterns of paths for that particle to follow to give the illusion of a changing and expanding physical reality.

• We are all sharing the redirecting of the path of that particle because we are all one consciousness acting upon it.

• What we perceive as moving through time, or manifesting something, is an illusion caused by a change of our perspective to observe and redirect that particle's movements in different ways.

• In other words, you are recreating (manifesting) your entire universe in every Now moment through shifting your perspective of consciousness. But our habits of thought (habits of perspective) are such that the manifestation of each new universe in every moment seems to be a continuation of the last universe...so we think there is only one Universe.

• In order to manifest something (as we physically-based humans understand it), we must try and shift our perspective of this one particle in this one moment of time enough that the re-creation of the entire next universe is sufficiently distinguishable from that last one that we appear to have manifested something physically in it that wasn't there before in the way that it was in the previous universe. So, manifesting is really about making one universe seem different enough to the last that you notice the difference.

So, to come to your question, everything you want is already created in the moment you think of it. Thinking of it creates a potential universe containing it. But where you choose to focus with your consciousness is what determines what potential universe is realized. When you decide to focus your consciousness dominantly within that series of universes that contains the potential you are after, you will bring about the physical experience of it.

So what is energy flow really?

Well, is energy ever flowing towards something external? No, it can't be because you are re-creating the entire universe in every moment and that universe is personal to you. Everything in it is your creation - you cannot create something new without creating a new universe with that new thing in it (a new path for that one particle to follow).

Energy flow, in my current understanding, would be more akin to consciousness having an intent of focus, and the energy flow being our interpretation of the potential difference (like electrical voltage, but in a vibrational way) of that new intent as compared with your current intent.

I'm not sure if I'm explaining this well. As I said, I don't think these are ideas that are easily understandable from a physically-based perspective. And I'm struggling to verbalize these concepts myself right now.

Does that bring you any closer to a better understanding of an answer to your question? I think you'll have more chance of finding an answer when your starting premises are based on firmer foundations, like the ones given.

If this still doesn't make things any clearer (and I don't blame you if you are even more confused now!), say so, and I'll take another stab at it. :)