I've been seeing a psychiatrist for almost a year now and was told that I don't quite have enough symptoms to diagnose MDD or GAD, but I do have enough to take some meds and do CBT. Pretty much the whole time we've spent finding a prescription that works for me and we succeeded (for now). 

That's helped a lot, but I would like to reevaluate my symptoms with her. After reading about BPD, I realized that I was kind of in an intense state when I first went but I don't think I knew it at the time (especially a with very unstable relationship at the time which has since ended). How should I approach this? Also, I am 20 and I've heard it is a gray area with diagnosing people young so I'm concerned that that will impact this