My manager had some magazine ads that I wanted to buy for the company, so I stole her copies from her desk because I was too lazy and cheap to buy them for myself.
Why would you take them from your manager?
I wanted to have my own to look over at home.
If you want to see ads that your boss has, it would be better to ask rather than stealing them from her desk. If she finds they are missing and knows you took them, you could get into trouble.
I'm just doing this as a normal thing and it's not that big of a deal.
Stealing is a normal thing to you? Mostly everyone else would disagree and consider you a thief. It is never right to steal, and you could lose your job.