What will fix my weak chin? (photos)

I am lacking a lot of self confidence when it comes to my facial appearance. My upper lip is very short and it is very hard to close my mouth. When I do try to close it, my chin dimples/wrinkles. It takes a lot of effort to keep it closed. The only way to relax my chin is to leave my mouth open; which is not very attractive. So I was wondering what procedures could fix my mouth and how much it'll cost.