I'm afraid of losing it all

So I thought I would give this a shot. My name is Nick and I just moved to the DC area from Michigan.

I just started this new job right out of college and it is directly related to my major. So far, I have been making a lot of new friends and I love it in this area. However, I do not feel secure with my job.

I always feel like I am not doing a good enough job in my position. With that being said, I have this chronic fear that one day my supervisors are going to get the idea that they can find somebody better and decide to let me go.

I don't know how to cope with this. Throughout my life, I have always wanted to move away and start a new life in a big city. Right now, I have that, in that I am going out a lot on weekends, making a lot of new friends and having a lot of fun here. It is like a dream come true (as cheesy as it sounds).

I can't imagine moving back home to Michigan if things go bad. My biggest fear is not that I will lose my job and not have a source of income to pay the bills, but that I will lose everything that I have worked for and have always wanted.

I admire you for starting life in the big city and making a go of it. For what it's worth, it is a very common belief to believe that at any moment your boss is going to realize that you don't know what you're doing and can you. I've felt that way and my Mom mentioned feeling that way every day for years at her job.
You might want to think about what specifically stressed you out, just so you feel better.

Are your insecurities about your job valid? Do you have evidence or reason to believe that your performance is subpar or is this more like an anxiety/worry that isn't well-founded?

Congratulations on living the life you dreamed of! Many are too afraid to even attempt it. The good news is that you are really doing some "networking" while out and about meeting new people. If you lose your job, you will probably find another one quickly. I would recommend that you take any continuing education classes that may be available to you and/or classes offered at work, perhaps? Anything that shows your managers your desire to do a good job for them.
The only pitfall ahead may be the office politics that may be inevitable but I'd just be friendly to everyone and never talk trash about someone. It comes back to bite you

I don't think you should worry about your position. Employers and supervisors always support employees fresh from college because they tend to be aggressive in learning and doing the job. I don't think your supervisors expect too much from you yet. Think it this way: it's the right career for you that you should consider this employment as NOT just a job but an extension of your school and that you have a great opportunity right there being learning more while being paid. Go over your job responsibilities to evaluate your capabilities. Strengthen the avenues where you are weak by investing more time in learning that matter. There is a big difference between theoretical and actual. What you learned from school are theories which is not as vague as the actual application. Consolidate both theoretical and actual experiences to be more equipped in finding a work place where you feel more confident to do the job.