Every time I look in the mirror, I keep seeing sagging jawline. How can I manage it?

Since the college entrance exam, I've been going to outdoor cafes with friends often and taking tons of pictures. But when I get home and sort through my photo album, I often get frustrated because I don't like the photos as much as I used to. Especially when I zoom in on photos taken from the side or at an angle, my sagging jawline stands out noticeably. I used to think my face was just round and cute, but now I think it's simply weight gain. It feels like my entire face has lost its elasticity and collapsed, and I dread looking in the mirror. I vaguely knew that my daily habits of looking down at my smartphone and keeping my head down were bad, but I never imagined I'd see this much sagging jawline in the mirror. Every morning, I diligently rub my jawline with a gua sha and try various lifting masks, but they only last for a moment and don't seem to solve the underlying problem, which only deepens my frustration. My friends try to console me, telling me it's not time to worry about it, but you know those subtle, subtle changes that only you can see when you look in the mirror? My biggest stressor these days is the dull feeling of my jawline, which no longer looks as sharp and smooth as it used to, like a double chin. I try to conceal it by applying makeup much thicker and wider than usual, but when I'm standing under bright lights or at an angle, the sagging jawline finally catches me. This sagging jawline is so visible that it really erodes my confidence. I've been using expensive, high-quality firming products for a while now, but I'm starting to think I need to seriously consider professional care. Are there any of you who, like me, have seen noticeable results with home care or procedures because of your concerns about sagging facial lines? If you have any suggestions for posture correction methods that can be implemented immediately in your daily life, or if you know of any firming creams that have proven incredibly effective, I'd love to hear your recommendations. I'm curious to hear about your experiences and how you've wisely managed and overcome these concerns when they first arose.