Brightening care question

Hello, I am a 34-year-old woman who is usually afraid of the dentist. Just hearing the sound of a dental clinic gives me chills, so I tend to avoid going to the dentist. Sometimes my teeth feel sensitive, but if I wait a few days, it usually gets better... You know, I’m sure I’m not the only one who feels this way, right? I keep delaying going to the dentist, and it’s a repetitive cycle. In the past, I used to get a scaling once a year without fail, but these days I even postpone that. My biggest concern lately is teeth whiteningㅠ I think my teeth look as yellow as Yoo Byung-jae’sㅠㅠ

I don't smoke or drink much soda, so I wonder why my teeth are like thatㅠ I looked into whitening, but it's really expensive and I can't afford it. Are there any other effective methods for whitening?