No, you are not weird.
I do exactly the same only I do start at my right side, than work to my left side to do my chin and upperlip the last ones.
I even think it has to do with the very hairs.
In my case the ones on my chin are the most durable to be removed so I leave them till the last.
My upperlip I have to do carefull not to cut myself.
My cheeks and jawlines are most easy to get rid of as they are also softer.
My upperlip and around my mouth together with my chin is to make sure that if I have to give my spouse a kiss it will not hurt her.
Relic from oldtimes!!
Good excuse for you to tell the mistress: she probably will feel flattered to hear!!LOL!!!