Tattoos, laser hair removal...botox. I see them all on a level.
Do what you need to do or feel compelled to do with your body so long as it genuinely makes you feel better about your presentation/appearance, and doesn't inflict more harm than ease to you.
I say embrace it a little bit. You care about your appearance. That is a good thing. You may be feeling a bit silly and vain and maybe Botox is -- or maybe it makes a difference to you which makes a big difference in you -- or anywhere in between or all depending on the given moment.
A little botox doesn't have to be a slippery slope. I promise ya :)
Go on with ya bad self, and do ya thang, and feel good too.
So long as you can laugh at yourself if you think you might be being a little silly -- I say you are in the clear.