wtf happened

so i didnt get the produce manager position.. was told i need to work on my presentation.. what does that even mean..and that i need to work more the gemini(inventory machine we have that you do everything from price change to inventory on)well i dont get it.. while we have not had a dpt manager in produce for almost 3 months.. who did most of the dpt manager work... me.. i did everything on the gemini. i dont understand how i need to work more on it.so who got the postion.. the fucking cake decorator.. how is she more qualified for the job then me.. when i interviewed first thing they told me was we have 4 vaiable candidates..well with my current place of employment i have learned that when they say that its never good( been in the situation b4 a few times). then the assistant manager tells me that she hates when people assume she already has her mind made up b4 interviews.. its funny cause other assistant managers right up to the shift manager would come to me and tell me to take care of stuff and tell me well your the dpt manager arent you they gave it to you didnt they.. i was like nope they haven't even interviewed yet.. and they say oh..all confused. maybe thats what she was referring to when she said she hates when people assume. i dont know. what sucks is i let them use and abuse me again.. i did my job plus half assed my through dpt manager job last 3 months..i trained all the people in produce..all of them. and what did it get me... nothing.. this has happened to me b4 with my current employer. when will i learn.. i just have to accept the fact i will never be a manager with them and deal with it and accept i will always be a floor associate.. i even let them censor me.. they wanted me to clean up my language that if i wanted to be dpt manager i need to work on it.. and i did.. i slip up maybe twice a week now which is amazing.. i let them change me..how fucking stupid..