There is not enough info to say this fits, but liking those toys at 19 might imply a codependent relationship or unusual bond/attachment with the toys. You did not describe autism symptoms. Most adults who like toys, anime, video games, MMRPGs, D&D at game clubs, etc. are NOT autistic. I will not agree or disagree with BPD or autism based on the info given, on any other amount of info given. Neither should anyone else. If your doctor says you have BPD, you need to learn about it and continue going to therapy.