Yeast infection ??

So, I’ve been having this weird discharge and I decided to grab a mirror and look. There was some white discharge more like cottage cheese. It wasn’t a lot but it’s not usual for me to have this stuff. It isn’t too itchy but it is very odd. I had sex in the beginning of March so I was wondering if this could be a std, however i don’t think so because it would’ve showed earlier. I actually think that I got this cause ive been using my shower head a lot to masturbate :/ and I think that it unbalanced the ph or something of my vagina. What do u think ?