I have an overbite and a weak chin. As well as puffy cheeks. How do I get rid of these problems? (Photo)

The overbite is very annoying. And my weak chin doesn't help. I usually push my jaw forward when others are around and I suck my cheeks in. This helps but I want it to be natural I'm tired of faking it. I am on a budget so I'm not looking to spend thousands of dollars on surgery. Please help me determine what would be best in my case.