Water like fluid coming out my vagina on my period?

Okay so I am 16 years old and I have never had sex. Okay so when I am on my period my tampon gets full pretty quickly. I am 4  days and very very heavy! But recently for the last 3 months or so when I pull it out the main fluid on it isn't blood, it's like a watery fluid on the tampon. It has no aroma to it like water! It also ends up in my panties when sometimes in the night my tampon overflows! My period is irregular if that helps! Please help me - I don't want to Google anything as that would make me worry more😫