Most likely, no, you will not have BPD for the rest of your life. At one time, experts did believe that BPD was a life sentence; they thought that BPD was not likely to respond to treatment and that BPD was always chronic and lifelong.
Now, we know that this is a complete myth. Research has shown that almost half of people who are diagnosed with BPD will not meet the criteria for diagnosis just two years later. Ten years later, eighty-eight percent of people who were once diagnosed with BPD no longer meet criteria for a diagnosis.
In addition, there are now a number of treatments that have been proven to be effective for reducing the symptoms of BPD. So, with treatment, the disorder may remit much more quickly.
Amarine, MC, Frankenburg, FR, Hensen, J, Reich, DB, and Silk, KR. "Predictions of the 10-year course of borderline personality disorder." American Journal of Psychiatry, 163:827-832, 2006.