Am I Lying About My Mental Health?

Absolutely pursue a diagnosis! You might ask a mental health provider to test you for a personality disorder instead of specifically BPD to prevent confirmation bias.

I'm in the same boat, I've tried to tell my partner that I think I have QBPD but he basically just told me not to worry or think about a diagnosis because then I can just place all the blame on my mental health and not take any responsibility for my actions and behaviour. I just think that it will help me to better understand WHY I feel the way I do and how I can be patient and gentle with myself. But I keep second guessing myself... I often think maybe I'm just making it all up in my head and it's not as bad as I think it is. Feel free to pm me if you want to talk :)

What I've learned is, if you're worried you're faking it or don't have it, 9/10 times you've got that specific diagnosis. If you're really sure you have BPD, you should talk to your therapist/doctor, address your symptoms.