It's great that nothing bad has happened to you, but that's not always the case, so the information above should always be put into consideration. When I was little, I got my ears pierced with a gun, too. God, I wish I would have known how bad it is, because they got so so infected, even when I cleaned them like I was supposed to.
Some people are really afraid of getting pierced with a needle...they seem to think that guns are less painful. But they're not. I can speak from experience. I've gotten my bellybutton, eyebrow and cartilege done with a needle, and as soon as my eyebrow is fully healed, I'm going back to get my tragus.