Anyone diagnosed with both?

I'm being treated for BPD and it's going pretty well, good days...some bad still, but I'm trying.

My main coping mechanism throughout my life has been avoiding things...but not just avoiding...bailing on things, canceling or worse, going AWOL. See I get ambitious and want to push myself into situations that scare or excite me. Sometimes I show up, work hard and/or be sociable and everything is peachy. Many other times though, I cancel last minute or don't show. It's often due to being tired, depressed or unprepared. It's a constant, chronic issue. I've lost jobs and damaged my rep. I convince myself in the moment that it's for the best, that I will use that time to be extra prepared for next, or some BS. Could I have APD or is this a symptom of BPD? (Just based on your petsonal experience, I know you can't diagnosed me)

My life is hell because I behave like a flake and it's not who I want to be and hope I am. 

I feel this overwhelming shame for all the classes I've skipped and social occassions I've blown off. I'm full of excuses and full of shit and it's what I hate most about myslf. 

I am trying, every day...but when I convince myself it's ok to miss this one thing, there's no talking myself out of it.

Is something wrong or maybe I am just a horrible, selfish, lying and pathetic woman. What a joke I am to my old teachers, and my students (I taught music at home for a while)

It seems so simple for most people to commit to obligations, it's a matter of honor. Where is mine? 