Am I in the wrong?

So I’ve been really stressed with a work decision. Context, I work at a Sephora @ Kohls and the store is looking for a new beauty team lead. I had applied (I have worked there for about 6months now) and I had my interview and it went great, or so I thought. Well I get called into the office today to be told I didn’t get the team lead position ,which is fine I understand, but instead of it being a qualified worker from Sephora (example one of my coworkers), he chose a kohls associate with NO makeup experience at all, no manager training, no Sephora training, NOTHING.

Now I’ve put my whole heart into this job, I’ve had hours and days, MONTHS of training for this job, I’ve attended meeting after meeting, research after research, I helped set up this store (I mean literally help put together the shelves and products).

I wouldn’t be as upset and hurt if it was someone who has experience, and actually wore makeup and new about skincare. (Like I said before, I know some of my co-workers in Sephora applied, if one of them got it I would not be as upset as I am). I’ve had other managers firm around the store tell me “ it’s gotta be you, you’re one of the best,” it’s a surprise to them too!! No one is happy.

My boss then told me that he wants to train me up to become the “next team lead I’f anything happens” but I applied for this position twice now (once when I started and now this time). Then he tells me to “take her under my wing and help her learn). I shouldn’t have to train my future Boss. I at least should get paid for it. Why should I have to train my boss who’s supposed to know more than me.

I know I’m upset. I’m really trying to let it go, but it’s just getting to me. I don’t know if it’s just built up insecurity, but I’m loosing sleep over this, I’m constantly irritated. I’m really trying my best to be happy for her for getting this new job, but some part of me just won’t let go. Am I over reacting? How do I learn to just accept it and be happy for her?