Vaginal discharge, is it meant to be that colour?!

Anna
I am a 15 year old girl and I am sort of new to this app etc and the advice anyway, I always find that my discharge is a bit sort of yellowish but everyone says it's should be white?? I have been suspicious for a while and when I told me mum she just said its fine, I'm a virgin, I don't think I have an infection bc I've had one before and it's not been like this but if you have any advice I would be v v greatful!! 
Thanks