I think you did a fine job of explaining—in fact, I am going to recommend that you keep writing in the form of a journal. Find a journal, digital or handwritten, that will help you keep a daily diary of your feelings. I’d recommend that you begin with some simple distinctions, such as highs or lows of the day with a brief description of the events that have caused them.
After a month or so analyze the journal in a reflective way and see if there is a pattern to your emotions. Do you find yourself having a better time with people or alone? Learning something new or trying something new? This reflective experience can give you some insight into not only what you are feeling, but what may be the causes.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral