I believe that most people are good people, misguided or not, and most are trying their best to get along in a tough world... they don't have the desire or time to mess with people, and most don't even have the mindset to contemplate weapons to defend a life, let alone take one. I carry because I blend in with those people, and there are a few out of the masses that will take advantage of most people's trusting and non-violent natures. God willing, I'll never run into one of those cursed few.... but I might. And just as importantly, so might the people I care about.
I am surprised that no one has suggested you visit
http://www.corneredcat.com ... it's a fine website dedicated to the decision and mindset of self defense. Not just guns, either. I have been carrying for years now, but I still read it every now and then to help keep my head straight. I recommend anyone even considering a firearm or taser, OC spray, etc, check out this site!
EDIT: I wasn't allowed to have toy guns when I was little either... my mother hated guns because she found her mother dead - killed herself with a cheap small caliber auto. Very understandable dislike. Still, it was a futile effort. First came the guns we built out of Legos and Construx, next came the super soakers and nerf weapons, then the battery-powered squirt-guns that looked like submachineguns in neon camo (they even loaded from a stick magazine!), then laser-tag... it was really hopeless.
Still, I was afraid of guns until my fascination won out over my intimidation one day in college. I walked into a gun store with my brother, and with him egging me on, I walked out with the cheapest, oldest, history-laden military rifle I could find - a Yugo SKS (didn't know it at the time, of course). I still have that rifle, and I wouldn't give it up, even if it is unrecognizable after removing the bayonet, recrowning, and refinishing the stock.
I didn't get a pistol (my first was a H&K P2000) until my wife (then my girlfriend) received some threatening calls at her parents house. She was staying with me most of the time, and I felt I had to protect the cave, so to speak. At first I didn't like pistols, but they're grown on me. I think I'm better with most pistols than I am with most rifles, now.
It took me a LONG time to get used to carrying with a loaded round. The lack of a manual safety on the P2000 was a blessing and a curse. Blessing, because the LEM is a good system and the fear taught me trigger discipline. Curse, because my discomfort was shared by my wife - she doesn't really like any guns, and she really dislikes the P2000 because it doesn't have a safety.
I'm always happy to hear about another person entering the gun world, and even happier to hear about a responsible citizen exercising their right to carry. Please, if you have any questions or concerns, let us know. We're all here to help.