Insecure about the bottom half of my face. What are my best treatment options? (Photo)

I’m 19 years old and always have been insecure about my face shape. I have really large cheeks but it wasn’t too big of an issue. My main issue is the bottom half of my face, it feels very heavy when I smile. I also have TMJ from bruxism, but I haven’t had any severe symptoms. I want to be able to shrink my jaw and get rid of the large look. I researched about masseter botox in helping TMJ while also slimming the face but I’m not sure.