[Video] Am I Bipolar Or Just Part Of Growing Up?

Hello, so lately my life has been a complete mess. 
This all started about a year and a half ago. There would be days where I would be depressed, and felt ashamed for being depressed and started to take it out on myself by cutting or turning to alcohol. I would feel totally hopeless and worthless. I would just feel like a empty/hollow shell and have suicidal thoughts and sleep all day.
And then, I'd feel energized, and excited and ready for new things. The world would suddenly look brighter and full of color. I felt I was on top of the world and nothing could ever bring me down. My emotions feel like a roller coaster, and I just can't get out. It's confusing. 
I sometimes even have the feeling that people are staring at me, gossiping about me or laughing at me. Sometimes, I even feel like that someone keeps following me or planning to trick me.
There has been depression in my family, and I’m wondering if my depression could be a hereditary issue? But I just can’t understand why I have these hyperactive, extremely happy and optimistic moods. My grades are suffering from this. Am I Bipolar? Do I need to seek for help? Or is this just a part of growing up?

 A: Thanks so much for writing in about your concerns. What you're describing sounds to me like more than just "growing up" and I suggest that you get a mental health evaluation to get an accurate diagnosis. For my complete answer and suggestions, watch this video...Take good care of yourself!Julie Hanks, LCSW