Do I really need braces?

I am a young adult with a very noticable overbite and crooked teeth, but no other dental problems (not even wisdom tooth pain or cavities). I have been told since I can remember that I would need braces at some point, but it's been years since I've been to a dentist. I'm not sure if that would be neccesary, though. I know that there are certain health problems associated with overbites, like lisps, gum disease, and sleep apnea, but I haven't experienced any of those. When I've asked doctors or family members why I need braces, their answers are always either purely cosmetic reasons or "It can cause problems firther down the line" without any specifics supplied beyond that. In order to straighten out my bite, I would have to get braces, a pallette expander, and due to the size of the teeth in my upper jaw, I could possibly end up getting my teeth "shrunk" or removed. I'm also not sure whatnthis would do to the shape of my face, and I don't really want to change my jawline. I was wondering if, since I have no problems with my teeth beyond the cosmetic, it would even be worth getting work done. Again, I haven't had any previous medical issues with my teeth, and all of the other reasons seem to be purely about appearances. Do I really need to get work done?