While it may be a concern when you first start the game, once you have the funds to equip yourself properly, any race can excel at any job. Granted, a tarutaru warrior with great equipment will never be quite as good as an elvaan or galka with the same equipment. However, if you put time into getting good equipment, you'll still be better than the average joe. A well equipped tarutaru melee will outperform an averagely equipped melee in almost any situation.

Of course, such equipment to correct statistical handicaps can sometimes be rather expensive. That's why it might be difficult when you first start the game. It does pay to play to your race's stats when you choose the job or vice versa, but don't feel obligated to be a tarutaru if you choose BLM. At the same time, don't expect to have the easiest of times if you choose to be a galka BLM.