I had very bad winter depression (called SAD) for many years before I was diagnosed by my doctor. It may not be the whole answer to your issue, but please make sure you are getting plenty of full spectrum light (use a lamp if needed) and take a Vit D supplement.
Is this difficulty in making friends new or something that you have experienced in the past or other parts of your life? Is it possible that this is something that is more of an issue through your life?
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