What can I do about my underbite? I grind my teeth at night, and my two front teeth are chipping in the last 6 yrs (photo)

I am 19 years old &have an under bite. I have a space in the middle. I have been told I need braces and surgery in order to fix my bite. My teeth aren't what's the problem cuz they're not really crooked but my jaw since its farther out than the top. The surgery is very expensive, what can I do if I don't have the money needed? I really want to get this fixed because all my life I've been bullied and made fun of and the cause of a low self esteem even though I'm pretty.

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