Scared!

I started my work last week. At first I was a little excited and nervous at the same time but now after three days on the unit and working with patient, I am scared. what I fear the most is that I am not being a safe and effective nurse or that I may forget to chart something. while I am driving home and when I wake up, I can't help but think that my pt's are going to come after me a year later and say I didn't do my job as I should have. Please help, I am close to tears. I feel like nursing doesn't deserve me, I loved nursing while I was at school and I thought I was cautious enough but now I feel like everything I did doesn't add up to what I should be and I think I don't deserve getting paid, I feel guilty that they have to pay me. Is this normal? I am so scared to ask somebody else because I think they'll just laugh at my face. On my unit there are so many great and highly educated nurses but for some reason I have ended up with this nurse as a preceptor for which I can't find any respect for and I feel like I am not getting enough experience from her. I feel like everyone there hates me and think I am a dull & dumb nurse who doesn't understand or know anything. But I really want to stay as a nurse & trying to find my weakness to work at but still not clear enough. PLEASE HELP ME!!!!! (& thank you for reading and feeling my frustration & sadness) .