“Borderline Personality Disorder?”

I am not diagnosed with BPD, however the disorder has been brought up as a possibility by multiple therapists and psychiatrists. At the time I was 17, therefore could not be diagnosed. Through my research of the disorder, the distorted self image trait seems to always talk about change of goals, values, etc. I was wondering if change in view of ones physical appearance could be pinned on BPD. Some days I will look in the mirror and think I’m extremely attractive and see nothing wrong, but the very next day I might break down in tears looking in a mirror thinking I’m hideously ugly and should not show my face. It’s two extremes and hardly ever anywhere in between. Could BPD be something that would explain this happening. Also, now that I am 18, I’d like to get more analysis and possibly a diagnosis if this is a disorder I have. What professional would I go to if I wanted to get this tested? It’s something I’m almost convinced I have, and getting confirmation in either direction would be very relieving.