My face is asymmetrical. My nose slants to the left, and my bone structure is uneven. How can I fix this? (Photo)

It would be helpful to see a side view of your nose.  However, you nose does appear wide and a rhinoplasty could certainly address that issue.  The asymmetry is mild in degree.  However, correcting asymmetry is one of the more difficult things to deal with in rhinoplasty.

 A rhinoplasty to remove your hump and refine your tip and place cartilage grafts from your septum into the nose.  Narrowing your bridge as well  is what you will need. This iwill not correct all facial asymmetry but I would need an in person examination or better photographs to give you A proper answer. See a very experienced rhinoplasty surgeon for a natural looking nose without the overdone look.

A closed rhinoplasty procedure can address straightening the nose, narrowing the tip, narrowing the bridge, reducing the projection of the tip and reducing the columellar show. Leave the facial asymmetries alone, since  there is not much  can be done about it anyway.

I recommend a reduction rhinoplasty. Some simple maneuvers via a closed approached performed by an experienced surgeon can deliver the results you are looking for. Check the website for B and A. 

Everyone has some degree of asymmetry, when the fertilized egg divides for the first time (making you) the two halves don't perfectly align. Unless the asymmetry is very serious this is best left alone. Noses have a later growth phase and the nose you had as a child is not the same as the adult nose. I suggest you take photos of your nose as a child to your plastic surgery consult and point out the aspects of the youthful nose that you would like to recreate. It may not be possible but would be a good starting point.