Hello, I'm 19 Now And Back When I Was About

Hello, I'm 19 now and back when I was about 4-5 I had a bath tube accident where I slept and hurt my private part on the side of the bath due to extremely hot water, now my urethra is extremely uncomfortable it's been like that for a couple of days expect it comes and goes. Not sure if it's related or damaged tissues but it is very annoying cause it makes me so angry been so frustrated, and I tend to take it out on my partner but I don't want to tell him incase he thinks it's a sexual thing, but I've been tested for 3 of them