Got my first job and after a few months I doubt if I'm actually qualified for the job. I've been making mistakes not just with work but with people - minor ones, luckily. But I feel bad after making mistakes and they add up over time. Recently I've been having dreams about being fired and woke up scared and heart-racing in the morning. Every time a new task is assigned to me, my heart races and I can't help to be nervous and  reluctant against the task.

This is my first job ever, and sometimes I feel like I'm too naive when it comes to work and office life. I have no intention/passion to make the work as perfect as should be - or maybe I used to have but too many failures has changed me - but I just want to rush to make the tasks done and "get it over with". I seem to be working a lot everyday but hardly see any reward/productivity. I hate this. And perhaps it's because this is my first job, I feel that there are a lot of "rules" that I don't understand, and therefore I don't have the proper expectations of the consequences of my behavior - like who in which department I should contact for the issues, what does this may have impact on others, hell sometimes I don't even know enough of my responsibilities - I don't like it. 

Is it possible to force myself to overlook the emotions and just focus on work and life? I should be doing something else for other aspects of my life but the anxiety (?) has driven me think all day long about my mistakes and the unknown future, speculate if anything I did was actually not right, and guess if I'll be fired the next day because of low performance. I don't understand why work is so hard and anxious for me. How I wish I can be as with ease as other people.