Why is my overbite no longer being controlled by my retainer? (Photos)

I had braces for 2yrs when I was young. After removal, I loved my teeth; I got so many compliments on my smile! Got a retainer to keep teeth in place. Had 4 wisdom teeth removed in 2012 (2 upper, 2 lower); my retainer didn't fit anymore post surgery. Got new retainer, but no matter how often I wear it, overbite comes back. Found out that I'm "tongue thrusting". I have a very small chin/mouth, not a very defined jawline, so I don't know if it's my jaw's fault for my overbite? How do I correct it?

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