I want straighter teeth but I'm to embarrassed?

He has never said anything about braces...but i just want Straiter teeth I really struggle with hating myself and depression almost....so i think improving my smile would be a big help to me....I just don't know how to ask....our family knows his family personally and i don't want him to be like...*thinking in his head* wow I can't believe she asked for braces....what a douche! Is there any way I can casually bring it up? I have tmj if that helps....and I also think fixing my overbite and correcting my midline would help....what should I do?!?!:'( thanks