I am 10 I'm 5"4 and 145 lbs why is there stuff coming out of my vegina? ( a girl to answer please) <3

Sounds like a infection, most likely yeast, very common, don't you have a mother or aunt that you may be living with to talk to. This is normal and they will help you with proper treatment.

If you are 10 it probably means that you are growing up as all girls do... your body is getting ready for you to become a woman... If the discharge is kind of lumpy and you feel itchy then yes it may very well be an infection and you need to get that looked after, ask and older woman, your Mom, an Auntie, old babysitter... to help you with this.
Don't be afraid to talk to other girls and women about what is happening to your body. It happens to us all sooner or later.