I'm struggling a lot with perceived rejection. I've started volunteering and meet a lot of new people there, and there's a girl a really get along with and every time I arrive and she justs says "Hello" without coming to talk to me I start to worry that maybe she's mad at me and that she doesn't want to be me friend so what I do is instead of annoying her directly asking I come to her to joke to see that's she is okay with me. 

I'm hypersensitive to body language, facial expressions and tone of voice. My SIL is very busy with her job and every time she doesn't answer in a timely manner I start freaking out about the things I may have done wrong. 

Anyone has coping strategies for this? I try to not take things so personally and tell myself that there are a lot of variables in their life that could be affecting their mood. I'm so tired of this emotional rollercoaster.