I am 14 years old, and about 5 foot 4. Is it normal for me to shave my upper lip twice a week, and my sideburns every other week. I only have a few underarm hairs, which is why it's strange.

Sure, I would say it's normal.

I would say normal on the upper lip but the sideburn one is kind of creepy. I have never once shaved my upper lip or sideburns... what color hair do you have? Is it dark? Is it thick?

It's not creepy, everyone is different and everyone goes through puberty with slightly different timing and effects. Talk to you dad/ male relative it is a good chance they had the same thing.
It'll all sort itself out in the end, just try not to worry about it.

I am 14 years old, and about 5 foot 4. Is it normal for me to shave my upper lip twice a week, and my sideburns every other week. I only have a few underarm hairs, which is why it's strange.
Yeah its normal