Wedding Guests?

Oh where do I start? FMIL (witch), FFIL (alcoholic), FSIL (a B), one of the groomsman (Hubby’s friend) who actually pulled me to the side and told me he was going to get my husband so drunk and that I could do nothing to stop him, FBIL’s in laws (just returning the invite)

My FH's sister in law, she hates me for some reason and i'm just over her bs and i stopped trying with her. And my brothers girlfriend, she's just a horrible human being. I don't get along with either of them, but i'm going to have a seating chart so they will be placed far from me hahha.

Nope. If I don't like them, they aren't going

I’m avoiding working on my guest list because I know how difficult the conversation is going to be. Every time I think about it, I get stressed. We have people there right now who are on my fiancé’s side of the family/family friends he hasn’t spoken to since he was a child. I’m dreading needing to tell his mom that we can’t invite some of them because we don’t have the funds. We’re paying for everything ourselves.

My personal opinion is that I should be able to invite who I want for this day because we’re paying for the whole thing. But there’s family politics involved in this and it makes me sad. I want to invite only people I care about and has made an impact in my life. I don’t want to be courteous and nice and invite people I don’t know. Is that bad? How do you handle that situation without sounding like a mean person?