FREAKING OUT OVER WEDDING PLANNING AAAAA

UGHHHH after leaving my sister's wedding last night (which was way too much for me I had to leave early after they finished food because I was starting to tweak and couldn't take anymore ativan) the Fiance told me we need to start planning our wedding because we want it to be spring 2027. I am so damn nervous and ngl terrified because I've never had to plan anything even remotely like this before and I already have a hard time leaving my house because of anxiety and agoraphobia!! About an hour ago I had a complete break down and didn't even know if I wanted to have a wedding at this point SIGH, But I know if i can make it through the anxiety then I'd be so happy and joyful. It's not going to be big, a very small, cheap(ish) wedding. Just direct family and neither of us have any friends. Like, at all. But anyways, IDK i'm so nervous even thinking about it. I know my mom is going to help with planning and stuff and my parents are paying for it so I don't have to worry about that part but I'm genuinely scared I'd have a panic attack and ruin my own wedding