Social anxiety is very very common. I suffer from it too. I have gone to a social worker and have talked to her about my problems . She was wonderful because she was like a life coach. She explained to me what anxiety was and how we have many irrational thoughts that enter our minds and make us worry. We have to face our fears, face our thoughts type thing because I told her that I wanted to solve this throught councelling and not medication and that is what she told me needed to be done. I still have mild anxiety and its reallly like a rollercoaster but for me it is a lot of mental exercise/work that I have to do to overcome my feelings.
I know how you feel about your friends. I used to have frineds like that too! I grew up with one of them and I met another few friends during highschool and we were a group and I felt really uncomfortable around them because everyone ended up having their "best friend" and I always felt left out. I felt so uncomfortable that I avoided them and wished I had found new frineds...And I have and they are wonderful and are there for me when I need someone to talk to.
One more thing. You said that you have had this anxiety for nearly a year? Well what happened that you developed this anxiety in the past year?
Please keep us posted. You are not alone!