Why do people forget about me at work and leave me out?

Im never invited to any events, someone forgot to the mailing list and only added me upon request after 5 months, people don’t notice when I’m in the office, don’t try to make conversation with me but make small talk with others and also I’m the only one who is not in the WhatsApp group of our department that plans after work events even though every new intern gets added. Am I just ugly? I’ve been told I have a nice Figure and I dress well so why do people always leave me out. Now some people would say that maybe I’m too quiet and shy but I’ve known other shy coworkers and interns that were added immediately to the group and they are not attractive or flashy in any way. What is it about me that makes people forget about me?

Why do people forget about me at work and leave me out?
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