I think I have a discharge problem?

Every girl who hits puberty knows about the discharge before you get your first period. I'm 15, i got my period when i was 14 and had had the discharge for 1 or 2 years i think. but now it's like a daily thing! i'm kinda freaked out. its like white goo. I wear panty liners every day because of this and it's really starting to annoy me. is it normal to have this every day? is it a yeast infection or something else i should be worried about?