My teeth arein a very bad situation I can't even smile and chat with others I'm very ashamed. Now I want braces but I can't afford them because my mother is not working what can I do because I am really desperate

I'd suggest you contact a Dental College near your home. They often accept clients for treatment at a very reduced cost. You won't find any one who will do it for free.

How old are you? Are you old enough to work?

I am 21 years and studying

Some orthodontists offer payment plans that you can set up. As Flossie suggested, I'd check into a dental school as a starting point. Then maybe if you save up enough for a downpayment, you can set up an installment plan so that you can get the work done.