I'm 18 and have experienced a kind of burning sensation after I pee but it comes and goes every few weeks, sometimes months. This morning I had the same burning but this time a white, yellow substance came out (not sperm) and it hurts. after the substance came out it left a powdery residue and totally freaked me out. I'm still a virgin so I'm pretty sure its not an STD. I thought it might be a fungus or infection, eww gross, right? But I'm really worried, if it continues again I'll go see a doctor, but I'm just curious if anyone would know these symptoms.

-Tip of penis burning
-Feels like I still have to urinate after relieving myself
-excretion of white yellow substance
-substance leaves white, powdery residue

Thanks