Braces Experience: Can my smile ever be straight? Please help. (photos)

I have a slanted smile and a cross bite. After 3 years, I was informed that I will be free of braces soon but I don't believe I am ready yet: my smile is not straight, midline is off, and I think I still have a cross bite! Also, it seems like they don't know what they're doing. Every visit I make, they always wonder why my teeth isn't getting straightened. I believe they don't know how to fix my problem. They just constantly use rubber bands to "fix" my smile, but obviously, it's not working.

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