You won't find it a problem when you reach the end of the main scenario because you'll only get a new dungeon or trial at each patch, so it's only a temporary annoyance. Once you are at the end of the main scenario you normally just do roulettes, which don't allow anything else to be selected.

I remember you were making another character because you didn't like being a small lalafell, but that's not necessary because you can use a Fantasia to change from a lalafell into something else. You most likely got one free from beating the level 50 quest (any further fantasia you have to buy from the mog station).