Hermitt, I've had problems with depression for years. Anxiety and depression are commonly linked in my experience. Since you seem reluctant to talk to a doctor, I would suggest reading about social anxiety, and more importantly, social anxiety treatment. This would give you a much clearer picture of whether your problems might be connected to social anxiety. The book I found most useful is "Overcoming social anxiety and shyness" by Gillian Butler.
One of the first things I read about social anxiety problems was incredibly useful to me.
It is common for people to experience some anxiety in social situations. Some experience more severely than others, and some in more situations than others. Mental health professionals have a line where if the impact of the anxiety is over that line, they call it a phobia and/or say that you have a disorder.
The thing I read that was useful was that anyone concerned about the anxiety they experience in social situations can use the techniques in cognitive behavioural therapy (CBT). You might not be over the line, but it can still be a problem for you and you can still do something about it.
I have not been officially told "you have social phobia/ social anxiety disorder". When I went to see my doctor to ask for help, she simply told me that she thought CBT might help and refered me to a psychologist. The psychologist explained to me the thoughts and behaviours that were reinforcing my problems, and how to try changing them.
The psychologist has talked to me about work she has done with people who have anxiety disorders, and one day she made a comment "these kinds of phobias often take years to get over", so I suppose that after hearing the details she has put me in the general area of social phobia But we haven't discussed the exact definition of the problem in much detail - I was paying her to help me cope better with people, not to stick labels on me.
The whole diagnosis and labelling issue is interesting and somewhat concerning. It is useful for mental helpth professionals to be able to group people with similar problems and if you have a label you can go looking for information and people with similar experiences.
On the other hand, labels can create self-fulfilling prophecies and people make generaliations and judgements based on the labels. I think this is even more of a concern with children and children are being labelled more and more these days.
What I always try to keep sight of it that every individual is unique and what counts is finding what is relevant and applicable to you.