Its 0100 and I cant cleep and I am restless

I am so worried that I made the wrong choice for my nursing career by starting in MICU without any nursing skills.
The nurses there are so like mean and dont really want to be teaching me the basics. I need more time...for the basics and the critical care thinking..all of it...it has been 8 wks now and I am not feeling good about taking care of patients by myself. I feel like I did not get enough time for training. I dont know what to do.
Last week, my nurse preceptor told me that she had concerns about how fast i was learning and how fast I was developing critical thinking skills. Many times I felt abandoned, like she was not ready available when I had questions. I had to ask another RN for help with my patient. My patients were both crashing and I was overwhelmed and did not really know what to do. In the end, after all the runing I did I was criticized of my performance nurse preceptor who instead of being there for me was talking personal matters with another RN on the other end of the unit
I am so sad and frustrated that things are going this way. I am trying really hard to learn and giving my best, but they dont see that.
Please give me an advice. I want to be nice to everyone but its turning against me and I feel like they are seting me up for failure
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