You should watch a film call "Rampage" :
Rampage (2009) - IMDb
Lol.
Just try to think about the positive. You got a job!
I've been at my current place of work for nearly 10 years. My S.A was a real issue for me at the start as I was in an open plan office and had never been in that kind of environment before. But not very long after the consistent exposure every day for 8 hours I became completely at ease. Now my colleagues can't shut me up! Lol. Also the increased confidence it gave me stretched into normal everyday life. So I'm so glad I stuck with it because I am worlds apart from that person I was on my first day in that office. I would really like to move on now and make a change in employment. But I am too scared to leave a comfortable environment and risk going back to how I was. I don't think it would be that bad but I have no way of knowing until I gamble and take the risk. :-/
Well done for getting the job. It is a really brave step and stick with it no matter what! If your S.A does make it difficult, it will only improve day by day! Also it will help you fight you S.A in general.
You'll be great I'm sure!
Remember - Stick with it!!