Feeling so ashamed of my teeth

So I've had jaw pain due to acute TMJ. For twenty years.. I avoided the dentist for fifteen years because of the pain. 😔 I finally saw a dentist last year, no cavities. I've taken pretty good care of my teeth. But I think I'm seeing possible brown matter in the middle of two back teeth. It doesn't hurt but I'm almost certain they're not fillings from years ago.

I'm going to make an appointment Monday but I feel ashamed that this is occurring. I only skipped brushing last year Maybe five days total in a year due to severe TMJ. I truly hope they can clean the tooth and fill it vs. root canal.
It gives me anxiety already even for a regular filling Bec I also have a misaligned jaw, and I'll need breaks to close my mouth every little bit. Just another issue ugh. But I don't want to wait for any pain to begin Bec that can create infection. I'm glad at least I saw this.