Green Urine / no other symptoms / ideas?

Hi

I'm going to post here since the doctor is offline at the moment

I have recently just started to realize that my urine is green. Well, not dark green, but light green. I can only remember back a few months when it was green as well - if it has been green for many years I cannot remember, I usually did not check the color of my pee

If I drink a lot of water, the urine obviously becomes more clear. In the mornings, or after periods when I do not consume much water, my urine is more yellow / dark yellow

I am a 19 years old male and I cannot think of any symptoms. One other thing, that I think is completely unrelated, is that my skin itches/hurts and becomes a little red when I start sweating (just at the beginning of sweating, such as hot weather)

I do not eat asparagus and am on no medications or vitamin supplementations. The only things I can think of that are green and that I eat on an almost daily basis is the olive oil I use for frying and kiwis.

I have looked on the Internet and found that "oxidised bilirubin" can cause green urine, although I don't know if this is something bad, or what the cause could be for increased oxidized bilirubin in urine

I have had an UTI (Uniary Tract Infection) a couple of years back, but that was treated. Currently I feel no pain, burning, etc. when I go to the toilet., no fever

I am usually thirsty a lot, but I think I have gotten used to drink a lot. My urine is also mostly clear/slightly green because I do drink a lot. I don't think I urinate too much

So, basically, the only symptom is the green urine which I have been having for a long time, I just started noticing it now

Please, what could turn the urine to this color in a teenager?

I have (1/2 a year ago) had blood tests for kidney/liver done, as well as vitamins/minerals in blood - all normal. Had too little iron at a time, but was given iron supplements, which changed my iron levels to normal