okay bit of backstory, i’m 15 and started masturbating like this week or something (call me weird idc)

so i was just like rubbing my clit but through my underwear (it works) but i felt like something loose so i felt for it and found this

(pic below)

WTF is it?? if u can’t see it properly then it’s like a white but kinda blood stained teardrop thing which is almost spongey?? someone plz explain this to me