Could I Be Bipolar??

Lots of things have been going on in my life for the past few months that are incredibly stressful situations. There is a history of bipolar disorder in my family and I have found that at times I get very strong feelings that last a while and go away such as anger, sadness, and hopelessness, but at times I also find myself very happy and positive like im on top of the world and everything is perfect. It seems like a high because then I go back to the negative feelings. I want to put an end to this and just be happy being me. I really am a happy person and I love helping others and being social but sometimes these feelings hold me back and shy me away