You I have the same thing and I'm 12 and I haven't started my period yet. I have been having this guck for like 3 years now. Don't worry about it.
You I'm 12 and I also get that stuff in my under wear. At first I was about 9 or 10 and I used to freak out but now I'm used to it. I guess it just gets old after awhile. Don't worry about it,I don't.