Several people have said I've possibly got bipolar?

In the past someone said I had a "split personality" but they wasn't the smartest tool in the box. I could have ADHD and they wouldn't recognise it.
My own brother said I show signs of bipolar and I should probably get checked out..
Now my ex has been telling his friends I'm " possibly bipolar " but he's also not the smartest tool in the box.
I feel like I'm definitely not, I'm just extremely moody sometimes.
I've had a pretty traumatic childhood and I'm sure that could trigger bipolar but I feel like I definitely don't have it.
Do you think I should go doctors and double check or should I just leave it and go with my own opinion because after all I do know myself.
Several people have said I've possibly got bipolar?
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