Does anyone know how to heal dark line on lips?

Thank you in advance for reading, any advice would be appreciated. I'm so insecure about my lips 😞

I've had bad anxiety since I was a kid. I would bite my lips and literally tear the skin off (gross I know). So as you can imagine, they were chapped all the time. I would carry Carmex on me everywhere I went but it always seemed like my lips were constantly peeling and could not stay moisturized.

I ended up going to a institution due to some mental troubles and stayed about a week. Some of it actually helped me and I stopped biting my lips. They finally healed and I was so happy. That only last about a year. I was with my ex for a while and I became super depressed. I started bad habits again, including biting my lips 😒 It's not like I do it on purpose, I don't think about doing it. It just happens when I become anxious without me realizing it. I know it sounds strange.

I got help again and worked on myself mentally and physically. I am now in a healthy relationship with a man that loves me and is amazing. I no longer bite my lips as I have learned to control it again, which feels great. Although, now I feel like my lips are scarred 😟 I have a dark spots, almost like a line that is pretty visible. Anytime I meet someone new, the first thing they do is look at my lips. Like they openly stare. I've heard of people talking about how I'm pretty, but my lips ruin it. It makes me feel so insecure that I avoid meeting new people. I avoid human interaction if it doesn't require me to wear a mask. I'm just so sick of feeling like this and looking at these terrible spots on my lips 😓 Everyone tells me to just use Carmex, but I've been using it for YEARS with no results.

Edit: thank you for the support and recommendations, I really appreciate it! I'm not positive the spots are from biting, but I assume it is due to the spots being in the same spots I use to bite