I faced this situation in my life twice. The first time was terrible, I was young and felt so frustrated and sad but I didn’t quit, I continued working alone but always open to others, noticing and helping whoever I thought might be needing my help. Years later I received feedback from people I helped at that time and was amazed with how grateful they felt with this small actitudes. The second time I faced this situation, when nobody talked to me or include me in any “celetration” I continued the same way i was, working, smiling, walking in the office facing people and being gentle — I know it was not about me, so I didnt’t need to worry. As long as I felt good, I would change the energy around me. And I did, made new friends and a very nice place to work. But still having several people that would not look or talk to me at all, but that is ok, no problem at all. Respect them and respect me.