do not do anything to your labia.
there IS such a thing as stretching one labia longer to meet the other (some cultures find this to be asthetically pleasing.) I would be very careful, though.

To SHORTEN labia, the only thing I can think of is surgery. This has its ups and downs. Some women are happy with the results. Others report a loss (or reduction) in sexual satisfaction. Some are just not happy with the surgery.
Sometimes, for medical reasons, this surgery is covered by some insurances. An example is if a woman feels a lot of pain from her rather long labia being caught/pulled in between her legs (when walking, etc.)

The bottom line is this (and i'm sure you have heard it a million times): You are absolutely normal, and a TON of labia are not even. Please do not compare yourself to internet models (many of whom have had surgery.)

P.S- Why do you want it to be even if you do not care what people think? That logic doesn't make sense to me.

I too have assymetrical labia. It makes me need to use extra lube with sex because the bigger side will tend to get rubbed raw. My labia were both the same size until childbirth tears damaged one side badly, and this is the way it healed. I have reduced sensitivity in the labia that has the most scars. It makes sense that surgery on your labia would give you the reduced sensation that I have from the childbirth damage. But the best thing to do is to just love yourself the way you are. Any man who doesn't love you just the way you are is a man you don't want anyhow.