I think it's okay to ask about "slight personality" or BPD. You're not going to look like a muppet, I promise.

I had literally asked my therapist point blank if she thought I had schizophrenia (because of my past hallucinations, delusions, and paranoia), and she said no. Then she proceeded to explain why she felt schizophrenia was not an accurate diagnosis for me. I felt relieved by it all because I had schizophrenia in the back of my mind for a while. Plus, since she gave me an explanation, I felt satisfied knowing what my proper Dx is.

All in all, it was a good conversation. I was wrong about schizophrenia in the end, but I felt A LOT better getting it off my chest. And I did not feel that I looked like a muppet. Not one bit. In fact, my therapist was GLAD that I talked to her about it because she wanted me to be open about my feelings and anxiety.