Ummm . . .
1) It was my first game.
2) I didn't read the manual first.
3) I thought the idea was to build a few really tough cities with as many improvements as necessary (coastal fortress anyone?)
4) Oh, what are all those pretty pictures around the map? What are luxuries and resources again?
5) Look, I can get pottery in 16 turns AND make gold! I can do that through the entire AA! What a steal!
6) No, I don't want to trade with you. I am an island unto myself.
7) Hey, good neighbors respect each other's boarders. We are all peaceful here. Nothing to look at.
8) Disband a unit? Why would I do that?
9) Upgrade a unit? Must require some of those pretty pictures I don't have.
10) A witch turned me into a newt shortly before I started playing. Luckily I got better.
11) I should have added a few sarcasm alerts. However, I most certainly had spears and they had tanks. I had more than just spears, but spears nonetheless - and 2 per city at that.
12) I was ambitious if not smart. I like a lot of land and a lot of friends. So huge map with 16 civs. I had 7 cities. Wow, how did the AI grow like that? And why are they all attacking ME!
13) Workers should mine mountains first. All those green and brown tiles could not posisbly be more valuable . . .
14) Pretty much read 'you might be an AI Civ' and I did everything the AI does. Only worse.