I'm thinking of stealing headphones from my co-workers at my internship nearly every week.
Why do you want to steal?
I've always wanted to steal so much in my life, so I want to steal something
That is an unmoral thing for you to do. You could get into a lot of trouble and it will be hard for you to find another job.
I'm fine, I'm not stopping until I stole enough to pay for a new pair of headphones.
Even if you think you might stop there is a chance you still might do it for the rush. Stealing from people is wrong and you should earn money the responsible way. You are hurting people that you work with and ruining their trust.