When I was very young, I tended to be a best friend with someone, then just hate them suddenly the next day. I think it happened a lot, we would hang out, and I liked them a lot (like almost I fell in love), then just out of nowhere, and I couldn't get even near them because I was just so disgusted and hated the person for no reason.

I had lots of intense anger problems since I was 10 years old, so I'm not sure if BPD can be mostly genetic? I had a very happy childhood, was never abused, rather I was loved. So I'm very curious... My father's side has a history of mental illnesses such as depression, etc. 

Anyone experience this?