Want to fill my chin with fat, but not sure if what i want is doable, help me please. (photos)

I for one think you look better with you lower lip as is. I think it makes your chin look too large and long with the crease removed. If you must try this, I would do it with HA fillers which will give you an idea of what it looks like before committing. Fat looks blobby in the chin, it does not give enough localized projection.

Fat grafts can be injected into your mental crease but you may not achieve the morphed results because of the tightness and movement in this area. The other girl you used as an example has excellent chin projection which you will not achieve by injecting fat into the crease.