I went to a wedding yesterday and there seemed to be a lot of mix-ups in the seating. Some tables had too many people with place-cards with not enough seats fpr all of them and some people who were invited didn’t have place-cards at all (I didn’t ask if they had sent in the response card). Inviting all the appropriate people to a simcha (and giving them seats) can be a very complicated thing, especially if you are a Rebbi in a large yeshiva. I assume that this is what happened in your case, The Goq. You seem to think that it was on purpose but there is a good chance that it was just an oversight and has nothing to do with you being invisible. You are being too hard on yourself.
Also, if I remember correctly Goq, you have stated that you work in an office with mostly women and you are a single man. It could be that all the women were invited because their husbands were invited and not because they work in the office. So it wasn’t that the baal simcha purposely invited everyone in the office except for you, he just happened to have invited all of their husbands.
Imy”h you should find your bashert and should have to deal with these issues of inviting people to your wedding.