I can’t speak for FFXIV, but if you want pvp in an MMO you might give guild wars 2 a try. It’s got 5v5 pvp matches where everyone is on an even playing field. It’s available in the free to play version, and you can go into it right after the tutorial if you want, don’t even have to do leveling.

There’s also a large scale pvp mode called world vs world where you have three teams of hundreds of players fighting over territory. That one uses non-equalized stats so it’s an end game thing, but it’s a lot of fun!