setlo

So I have been a nurse for 3 years now. I still feel like just a baby in the nursing field. I have moved to a different state and have been working in an urgent care facility for the past 4 months. I had 5 days of training at this job and from then on have been working regularly as the supervisor and only RN. I feel like I learned so much from this job, but I also am made to feel stupid when I don't know "the right answer" or ask a "stupid question". Recently I have made a few dumb mistakes and am feeling incompetent. I feel like I should be able to shake off these mistakes because I face them head on and deal with them in the appropriate manner, but I just can't let them go and I get so upset. I am told by others that these mistakes are minor, but they feel so major to me. I feel as though I have literally just been thrown to the sharks with every nursing job I have had and have just had to learn to swim and deal with getting yelled at and making mistakes. Because I have been thrown into jobs without much aide or training, I don't have any mentors to turn to. I believe myself to be a good nurse, but I have never been this down on myself as a nurse. I have been questioning myself and my career choice. I think I really just need a peer or a mentor to vent to. I don't know if it is just this job or what, but I feel unsupported by my manager and am sick of my nursing peers as they keep playing the blame game or are holier than though bull. I'm just frustrated. Any advice?