Have a white bubble looking bump at urethral opening

so I had this singular white bubble looking bump for several years and the first time I saw it was around when I first started masturbating.

there has been no sexual activity with another individual before that. (even till now, there has been none)

there are no pain nor symptoms other than the fact that I am not able to aim when I take a piss.

wondering what this might be and also where to go to get it tested. (don’t really know anything about this stuff)

have attached a picture below

i would try to see a urologist and get it sorted
as you have said it can’t be a std