Where on earth am I supposed to find my personal color, and how?

Lately, I feel increasingly confused every time I do my makeup or choose an outfit. The internet is flooded with comments like, “This is a must-have for warm tones!” or “This is a color cool tones should absolutely never use!” but when I actually apply them to my face, I have absolutely no idea what works.
Especially since my skin tends to be yellowish, there are times when I think I’m a warm tone, but then my face looks dull or red just from a slight change in lighting. Then I wonder, “Am I actually a cool tone?” but the next day, it feels like I really am a warm tone. Switching back and forth between warm and cool like this every day became so confusing that at some point, the very act of distinguishing between tones felt like a source of stress.



I didn't trust online personal color tests because the results varied every time, and if I considered getting a color diagnosis at a makeup shop, the cost was a burden and booking was difficult... Above all, I also had doubts, wondering, 'Can they really tell me the exact personal color that suits me?'
Lately, even when choosing a single skincare product, lip color, or blush, I find myself worrying, "Should I buy this? Does it match my skin tone?" This makes shopping itself feel so exhausting. I'm afraid of making a mistake, and I worry that using the wrong shade will make my face look even duller...
Where would be the best place to get a diagnosis to find out my true personal color accurately?




I'm not sure if it's okay to go based solely on online reviews, and there are so many places claiming to be experts that I don't know what criteria to use to choose.
If there are others who are confused like me, or if there are those who have already received a proper diagnosis...
I would appreciate some realistic advice on where to find an accurate and reliable personal color diagnosis.
I really want to stop getting disappointed after using colors that don't suit my face...