Hi, I'd like to help you with your question.
It sounds like you may have a mood disorder and possibly a social problem as well. Though having a disorder can cause some discomfort in social situations, just because you have one does not guarantee you will have any social awkwardness. So further investigation of your symptoms is in order.
The description you have of your symptoms does sound like Bipolar disorder. To be sure, you need to see a therapist or psychiatrist for a full evaluation. They will talk to you about your current symptoms as well as any past issues, including developmental problems. Once they provide you with a diagnosis, they should let you know about your treatment options. In most cases, outpatient therapy with medication to help control the symptoms of Bipolar disorder. To find a therapist, you can search on line at http://www.bacp.co.uk/.
Once your symptoms are addressed, you may find some relief from your social awkwardness. If you do not, then you may have a separate issues such as low self esteem that is causing you to feel different socially. Since this also can be worked on in therapy, you will probably find the most relief by talking to a therapist and developing new ways to relate to others socially.
I hope this has helped you,Kate