(Sorry if my English is bad.)

AITA for not wanting my best friend to go and apply for the same job as me? 

A couple of weeks ago I applied for this job because I'm looking for something to make a little money on the side while still studying. It pays pretty well and is very close to where I live.

Before going in for an interview, I told my best friend about it and just told her all about it and how I would really like to get it. (The interview went well and now I work there, which is great!) Yesterday she told me that after I told her about the position she went ahead and also sent in an application. At first I saw nothing wrong with it, but at that time it wasn't clear at all that I was going to get it, so now thinking about it, it kind of rubs me the wrong way that she would do that, basically sort of jeopardising my chances of getting it. 

She also has done the exact same thing before with a pretty cool internship I told her about. 

Am I being overly sensitive? 