hyperpigmentation

hello people of reddit, my first time posting here.

i have been struggling with hyperpigmentation since I was 12 if i'm not mistaken, it started specifically on my left underarm, i noticed it had a shadow to it but my right underarm was still okay. fast forward to the pandemic i think i was about 14, i noticed my groin (singit) was darkening aswell ( eventually now i'm 19, my lips (kitty), inner thigh and buttocks started to darken too but i could lighten it (buttocks) from time to time. now please i need help because i've been missing out on outfits because i'm insecure, i feel like i have tried every trick in the book, calamansi, lemon, baking soda, turmeric, glycolic, every whitening soap/cream/from derma, now i’m getting intensive whitening at skin station but i dont think it’s doing its job aswell, i also tried retinol, it helps but when friction happens it becomes darker so i ultimately given it up, no i’m not overweight/obese (i’m only adding this bc ik it can be a factor for hyperpigmentation) but i did gain a few recently but its still within normal for my height, i think the one from my inner thigh is from rubbing because my thighs kind of gained, about my lifestyle its okay too, also my left sides (ua,groin,innerthigh, buttocks) is always darker than my right, why could that be? please help me 😢