Have you ever considered that wanting is more than longing for something you don't have? Wanting is also about consciously nurturing a feeling of happiness. Don't you feel happy imagining having what you want to have or doing what you want to do?
The brain cannot tell the difference between an actual experience or a vividly imagined one. It simply reads the electrical impulses and chemicals compounds that your thoughts generate. Real or imagined? To your brain, it makes no difference.
But, what does make a difference is that by even just imagining having something you desire, you experience the same emotions you'd experience as if you actually had it. And in the long run, we're not after the thing, we're desiring the feeling we think the thing will give us. But, you are the only one who can generate a feeling, not a thing. How wonderful to know that we can have the feeling before, and even without, having the thing.
Desires are meant to feel good and when you're focused on what you truly want, you do feel good. But, what if thinking about your desire makes you feel bad? What if you want a loving relationship with your child, but all you do now is fight? If you are feeling bad when thinking of having a better relationship with your child, then you are not thinking of the happy potential, you are thinking of the undesired now. You are focused on what you don't want.
"You cannot desire something, predominantly focus on the absence of it, and then expect to receive it, because the vibrational frequency of it's absence and the vibrational frequency of its presence are very different frequencies." --Ask and It is Given, Esther Hicks
For every subject there are two parts: it and the lack of it. Imagining or experiencing what we desire always feels good. Imagining or experiencing the lack of what we desire always feels bad. Your feelings will indicate where your thoughts are centered.
Your thoughts feed your reality. Think of what you don't want and you'll get more of it. Think of what you do want and you'll get more of that. You are in total control of your experience of life. It can feel as you wish it to feel. But, it does require awareness of your feelings and the commitment to manage your own emotions. Small price to pay for happiness! "Desire is the starting point of all achievement, not a hope, not a wish, but a keen pulsating desire which transcends everything." —Napoleon Hill "It sometimes seems that we have only to love a thing greatly to get it." —Robert Collier "Whether it is a thought of something you want or a thought of something you do not want - your attention to it invites it into your experience." —Abraham