how do you keep cool and not take things personally

to put it bluntly i have a personality disorder and are hypersensitive, and i often take personal what people do or say, then i feel very angry....i'm also a very anxious person publicly and tend to be ''standoffish'' too......i'm just a male all alone who has had a difficult life and never found relationships, never had a partner......there's too much to put here.

i often take it personal what people do or say and i give off the vibe in public, like ' don't come near me'...ive never really had a big group of friends, only ever had one or two at primary school, now ive ended up alone and i'm now in my 40s...i just have my 2 elderly parents for support.

i know this question probably comes over as all over the place, but thats how it is when you have a personality disorder, anyway, how can i learn not to let people get to me in general or take things personal?

people often treat me standoffish too and are unfriendly with me, and that gets to me too, makes me feel angry and offended.