I have posted some advice on the general issue of people who are un happy being single.
Read it, and understand the truth of it.
The whole problem is that people do not recognise this stuff for what it is. It is a science. If you are not born with the natural ability, then take it!
Whilst I certainly have the capacity to love, I do not fall in the stuff. I would have to dive.
This girl you want...
...Do you think that there is something magical about her? Do you think that she is "the one"? Is that what this is about?
Beyond your feelings that are merely chemicals that can be controlled by a basic understanding of your subconscious, what can she do for you?
If you think that she is wasting her life, then surely you must think of her as a fool.
I don't know about you, but fools are of no use to me.