I like the texture of snot
That is gross. Why would you like the texture of snot?
I don't know, but I'm pretty turned on when it's on my hands or on my dick
It is wrong to be unclean like this and it can make you sick. You should not spread around germs like this.
I'm only doing it with my girl, so it's okay and she seems to enjoy it.
Snot carries germs and if you're sharing it between you and your girl you could make each other sick. It's okay to have kinks but you shouldn't put them ahead of basic hygiene. Try finding another way to enjoy yourselves that is safer.