Scared My Future In-laws Won’t Care.

Honestly, they sound awful. I would not allow people, who are clearly judgmental and rude, affect my life like this. If they are not excited or don't care that their son is getting married, that is their problem. You deserve to be excited and celebrate your engagement and upcoming marriage. Don't let them ruin this time for you.

Have you told your feelings about this? Sometimes you have to cut people off and live your lives together without them. Not everyone gets along and it is what it is.

That sounds like an unpleasant situation and that is really unfortunate. Where is your future spouse (FS) in all of this? Does he see the situation the same way you do? Are you two united in how you deal with his parents? If they have never said anything mean to you then I'm curious how you know everything they don't like about you in so much detail. I sure hope your FS isn't passing that along to you, because that would be so unnecessarily hurtful.

As for this: "When I tell people I’m marrying the love of my life, who I have been dreaming of marrying since I was 14, I want them to be HAPPY for me! Especially if they are my fiancé’s parents! Is that too much to ask?"

I am sorry to say this, but yes, that IS too much to ask for the simple reason that you can't control other people's emotions. People around here love to say, "all feelings are valid." So that means yours and their feelings are valid. But you can only control your own feelings and actions. So you and your FS will need to decide how to move forward with your wedding, your marriage, and your lives without the overt support of his parents. Accept this reality now, and you will be much more at peace.

My in-laws don't like me.

They don't even acknowledge our wedding anniversary.

I know exactly why - it's because I'm atheist - and I'm not changing to suit them. Quite frankly, they're awful people whose approval I would never want to have anyway, because it would mean being like them.

This is why I've never agreed with the "you marry the family, too" crap. Some people's families are just trash, full stop.

We have very little interaction with his family. We have established distinct boundaries. I have spoken to them I believe twice in seven years (since the blow up about my lack of religion) and he only talks to them when they contact him (usually when they want something from him).

Let your FH handle telling them he's getting married. If he wants you present, that's fine.