Do I have Bipolar Disorder?

Hi, I'm 14 years old and I am becoming increasingly concerned about my mental health. Since the start of the year and in the last few months especially I have been wondering if I may have Bipolar Disorder or possibly Borderline Personality Disorder. Firstly I will tell you about myself, I have always been a very pessimistic and often depressed individual. I spend most of my time thinking philosophically, writing music or drawing, I am a very creative kind of person. I do very well in school, I am one of the year's highest achievers. I only have about 10 friends, of which only two or three that are really close, I have very few female friends, and struggle in relationships because of my shyness. I find myself cut off from the world most of the time. I first though I may be Bipolar a few months ago when I went out with some friends for the day, throughout the day I became more and more hyperactive and I think this was my first manic episode. I felt invincible, like I could do anything, and that I was the best person in the world. This continued for about a week or so, during which I did many stupid things which I now very seriously regret. After this episode I went into depression because of my regret, this was not my first depressive episode though, as I become extremely depressed over very small matters quite a lot of the time. My depression is usually triggered by something, like splitting up with a girlfriend, but even when I am over it I will stay depressed for no reason, I know that I am over my girlfriend but I stay depressed, these episodes usually last about a month. Every now and then I will have different kind of episode, where I will feel happy consciously but be unconsciously sad, which is a strange sensation. I am obsessed with drugs, I have never taken any, but I am constantly feeling more and more need to get some to relieve the pain, and the urge is building and building all the time. I am scared to tell any of my family how I am feeling, I don't know why, I just am. Sometimes I hate the way I look, and try to hide my face, but sometimes I become extremely vain. I don't know for sure what this is that I am feeling, and I would greatly appreciate some advice. Thanks.