My advice is to remember that you are not bipolar. You are an individual who suffers from bipolar disorder. You would not say "it sucks that I am cancer", or even "it sucks that I am schizophrenia," when what you meant was "it sucks that I have cancer/schizophrenia." If you can see that bipolar disorder (or any other mental health issue) is not who you are, but what you suffer from, then it will help you avoid self stigmatisation. I think a lot of people feel stigmatised when they get their diagnoses. My advice is learn to accept yourself for you, and don't accept stigmatisation from anyone, even yourself.