Did Vincent have a personality disorder?

From the time he was a little kid, when we first see him, he's cranky and in the picture they took, not very happy. Do you think he had a personality disorder? I only ask because my cousin has been the Same way her whole life and her parents just thought it was hormones. When she got older (18, 19) she was tested and diagnosed with depression and bipolar disorder. Could. Vincent have had the same thing?