"Out there" in this scenario would refer to perhaps an activity you do prior to telling the story. For example, let's say you were a surfer, and you came back in and said, "I made plenty of mistakes out there....", we would know what you meant. Let's say you were a trapeze artist and had a show. We would know what you meant. So, the "out there," if you were to use it, implies that the listener knows what activity you had just been doing.
