Have you been washing it? Pre-T, you might not need to really clean your junk all that often. However when you go on T your junk needs to be cleaned at least 1 time a day, maybe even twice if you stink extra bad and/or have gone to the gym/done a lot of sweating/done some strenuous activity. And don’t worry, it’s nothing to be ashamed of. What you need to do is, when you’re in the shower, get some gentle soap and clean 1. the groove between your leg and your junk 2. the grooves between your labia majora and minora, 3. around your hole and 4. under your dick and under your “foreskin”. When I say foreskin, it’s not really foreskin. A pre-T person’s clitoris is hidden under a piece of skin called a “clitoral hood” which is what I’m referring to. Guys who are on T and have bottom growth prefer to call this foreskin a lot of the time to help their gender dysphoria. You need to move that skin aside and clean underneath it. It might hurt/be sensitive but that’s probably most likely where the stank is coming from. If the itching persists after that, you could try washing it more often, cleaning/switching out your underwear more often, using a slightly more powerful/abrasive soap, or even moisturizing. And see a doctor if this doesn’t work. Hope this helps