To answer your title question: They will feel weird at first, but then you get used to it. You won’t be able to eat stuff like gum or apples or any hard foods really.
Also, take good care of your braces and leave them alone. If one of your brackets is loose or it’s fallen off, just tell your parents and tell them to call the orthodontist (where you get your braces).
I know this because I used to have braces on my front teeth for 11 months.