Yes, it is possible to have both. And there is a lot of overlap between those two. There is hesitance about diagnosing teenagers with personality disorders before 18 because a lot of personality disorder behaviors might actually be normal teenage behavior in some cases, but the only personality disorder that can't be diagnosed before 18 is antisocial. A lot of therapists don't realize that, and there is also a lot of tendency to under diagnose autistic spectrum disorders especially in girls.

Girls with Autism - An Under served Population