Hi Só leighas. It's been awhile since we spoke. I'm not sure what happened between you and your sister? What makes you think thats the reason for your feelings toward others?

Try this exercise:
relax your thoughts.
Think of the people you "dont believe want you around"
Ask yourself "what have they said to support that idea?" then "have they been doing obvious things to show me they would rather be away from me?" then "what could they do or say to make me feel welcomed by them?"

Do the same for those you think are manipulators or liars.

After you have gone through all of what they do/say, go back through each one in the perspective of "how do i feel when they say 'hi'? why do I feel that way? how do i react to them while i am near them? why do i react that way?"

It might give you insight on what's going on n how to resolve it..