hi, i just want to know whether this is something other borderlines experience as well. for context, i have the symptom of being insecure in my identity.

it's hard to explain but i am something of a 'collector'.  i metaphorically and literally collect interests, clothing, bands, shows, and anything along those lines because i feel like, at the very least, these things are unlikely to completely change, and they make up parts of who i am like building blocks. this also goes for my sense of aesthetic and how i dress/present myself. i spend a lot of time shopping for clothes and possessions.

this is not always the case, but sometimes when i see people i percieve to be \*too\* similar to me, i find them threatening and get really defensive.

i become very insecure at the idea that if they like the same things as me and dress like me, and those things make up who i am at the moment, they are stealing my identity. the logical side of me knows this is very irrational and i know i'm not original at all (that would be a strange assumption) but it really disturbs me nonetheless; i've considered ending friendships over it. it's almost like theyre taking away these building blocks ive stacked by liking the same things and my self image and understanding of who i am and what makes me unique starts to crumble. 

for this reason, i've always been very possessive over my interests and likes. i feel like there is more to this but i don't exactly have the words to explain it properly. a lot of it comes from a place of insecurity and jealousy. regardless, i've tried to explain it as best as i can.

can anyone relate to this at all? and if so, do you have any tips to get over it? thank you :)