Female, 21. Is this a recessed chin? What can I do? (Photos)

Hi, I’m a young female (21) and I have always struggled with my jawline prominence. As you can see there’s not much space between where my chin starts and my neck. I see lots of people that have a more prominent gap. I’m very fit and workout 7 days a week so I’m not sure whether to attribute it to stubborn fat, recessive chin or just plain bad posture (Which I do struggle with). The second picture is what I looked like on a video of me just looking down at an item in front of me - it’s definitely bad posturing but I think there’s more issues involved too. I’m sick of feeling so insecure about it but I’m young and dr appointments are super expensive. I just want to know what the issue is and how to fix it so I can have a bit of clarity and think about it for the future. I have had chin filler before but I dont think it lasted very long and/or fixed the issue that much. In fairness I was 18 so it was a while ago and I still had baby fat on my face. The result is the last picture. In the past I have had teeth pulled due to overcrowding (my adult teeth would grow behind my baby teeth and not push them out), I had a surgery done by a maxilliofacial surgeon at 11 as my adult canine had to be cut out of the roof of my mouth otherwise it wouldn’t grow, my wisdom teeth were removed at 16 and I had braces from 11-13. Despite my experience with dentists, orthodontists and maxilliofacial surgeons no one advised me of a recessive jaw etc. it may have been due to my young age though.