I am sorry you are feeling like this. I think sometimes things can feel like salt on a wound if we've had bad experiences, and then someone is again hurtful to us. I had experiences with being excluded and made fun of growing up, and could never understand what was "wrong" with me. I also experienced some bullying in the workplace. As a result, for awhile I was very guarded and easily hurt whenever someone said something mean or excluded me, because it brought back all those memories and a feeling of "what do I always do wrong?" I found that I had to work through some of that and realize I was holding on to a distorted view of myself, and assumptions about how others saw me. I also think I allowed people to treat me poorly as a result of low self worth and didn't stand up for myself. I hope you are able to find people who treat you how you deserve to be treated. Also, maybe talking through what's going on with a therapist would be helpful to process some of the emotions and see if there's any insight they can give you into the situation?