I do and it's bad :( especially as the psychiatrist who diagnosed me said I 'just' made it into being diagnosable with full-out BPD as opposed to just 'traits of BPD'. I also have severe OCD (undeniable and lifelong) and 'associated depression'. I was pretty happy to be diagnosed tbh - because it was an explanation for all the ridiculous behaviour and emotional rollercoaster, and it was 'validated' in my mind that this is not 'normal', and therefore that means that life doesn't always look like this for everyone (which would be a pretty awful goal to work towards). It also means an identity, something to make sense of myself and 'belong' to. However, I have 3 main fears:

a) Since I have felt so out of control, I kept constantly rushing and rushing the psychiatrist to get some kind of verdict out, so she diagnosed me in 2 hour-long sessions of assessment (after meeting with me for about 6 or 7 sessions over a 3 month period prior to that). (I can have issues with impatience and obsessiveness so I guess that came into play).

b) that some of my symptoms (such as being unreasonably obsessed with one person, self harming) could be attributed to other things such as OCD or depression. (obsessiveness and OCD in particular).

c) I'm only 19 years old, only 2 years out of an incredibly toxic relationship with my mother whom I feel controlled and manipulated me throughout my adolescence, and still living at home despite refusing to interact with her (and my emotionally absent father) for 2 years. What if my relative youth and freshly broken home life means that I'm just 'passing' through a natural phase of turmoil and I don't have BPD? Some of my issues (such as cutting people out completely for slight infractions) have improved over the last year or two that they've been present simply as I've come to realise that it doesn't achieve anything.

Do you guys ever get this? I'm also worried that the fear of being uncertain about having BPD is leading me to act out deliberately (e.g. 'think' myself into feeling empty, even though that was marked in the assessment as a strong problem anyway... although that could be depression too :/) 
I have also come very close to doing stupid shit (such as suddenly dropping out of school without thinking it through) or actually done it (sneaking out of school and taking random journeys across the city on a whim), which I don't know if it's fuelled by my desire to 'prove' to myself I must have BPD in order to gain some certainty. It's getting a bit out of hand, and I'm starting to worry that I genuinely will do something rash like drop out of school without knowing why or whether I really 'mean' it and ruin all my prospects of getting out of my emotionally abusive home. I just don't know what to do about it. Your opinions and advice would be greatly appreciated right now - thanks :)