to file or not to file

ive had the worst habit of biting my nails for years. im trying to grow them out now bc I want long pretty nails so I can paint them and be like oh, look at my nails!! yass i grew them myself 😋but my thumb and index nails are the only ones that are rounded by themselves, and ive always thought the rounded shape is prettiest, all the others are squared I guess? anyone else have this weird natural nail shape thing going on, and how do I file the others to get that pretty rounded shape? (I've never filed my nails btw, so sorry if this is a dumb question)