I masturbated with a clean brush handle for 3 days in a row and i slightly bleed every single time. afterwards, i noticed a thin yellowish-green discharge, it has a slight smell, but it doesnt hurt when i pee nor do i have any itches?

Basics: Masturbation with a foreign object can introduce simple bacteria from the environment to the moist regions of the vagina. Odor is created by germs when they feed off the glucose & protein in vaginal fluids. Blood will be present if you scratch/tear tissues. This may represent a mild vaginal infection that can self heal or progress. Time will tell.

See below: Using a hard object for masturbation is more likely to injure internal organs, you may wish to procure a softer device for insertive masturbation, or try clitoral stimulation only for your pleasure. It would be prudent to refrain from insertive masturbation for a week or so to allow time for your vaginal tissue to heal. If the symptoms get worse, see a doctor. Get HPV vaccine. Wish you well.