why does my discharge change so much (I’m 12 8 months, no first period yet) and why does pasty texture discharge only last like 8-10h then leaves

Okay so it's totally normal for your discharge to change a lot, especially when you're around my age and waiting for your first period! Your body is literally getting ready to start a whole new thing, and hormones are doing all sorts of stuff behind the scenes. Different hormones are in charge at different times, and they affect what your discharge looks like and how long it sticks around.

Your body makes different kinds of discharge to keep your vagina clean and healthy, and sometimes it's thick and pasty, and other times it's more watery or kinda sticky. It changing through the day or over a few days is just your body doing its thing. It's not like a period where it's always there for a few days straight, and it's totally normal for it to come and go. When you do start getting periods, you'll probably notice your discharge changes a lot even during one cycle! It’s all just part of being a girl and it means your body is working just right.

If you want to find out roughly when your first period might arrive, there's a quiz on this site: how close is my first period?