Your damage spells are unfortunately limited, but you can still put out a significant amount of damage (About half that of a dedicated DPS) while having far more survivability. Don't forget that when you hit level 30 in the MSQ you should be able to accept a quest to unlock having your chocobo fight alongside you, which will help with open world combat, and you can dive deep into its attacker tree early on rather than using it for heals like a DPS would.