I'm lost on what to do.

So I really dont know what to do and it's really frustrating.

My fiancee is not autistic, and she gets mad a lot with some of my tendencies, and some of my immaturity.

For example: I have a horrible memory. I can forget a large part of a conversation we had a few minutes after we have it, or the next day. However, if its anything to do with things like: guns, video games, and/or history of World War two I have every good memory. She thinks that I just only remember what's important. This is 100% not true, and our relationship is so important to me. I just have trouble remembering things.

Next is my slowness. When it comes to most things (cleaning dishes, doing homework, writing my thoughts down, cleaning the house, folding laundry) it takes me a lot longer to do them, and as I've done them more and more I've certainly gotten better, but I haven't gotten any faster and it really frustrates her.

Another issue I have is logic. I struggle with this on a daily basis. A lot of things I decide on seem logical, they have thought, but when I Express myself or do the logical thought, it always seems to be wrong. My train of thought always seems to hit a wall.

Also, identifying social cues and being in social situations is something I really struggle with. I dont understand sometimes what I should or should not say. I'm awkward to be around (I've gone to meet ups and it's gotten easier), I dont have much relevant to bring to a conversation except if it's one of the topics I mentioned earlier and then I go obsess over it, and it makes others uncomfortable.

Finally, I have a lot of trouble communicating with her. I know what I want to say, but I struggle with actually saying it. I studder a lot, I end up telling an irrelevant tale that doesnt have anything to do with what I'm trying to say. And it's like pulling teeth for her.

There are some more immaturity issues I have, but it's not relevant

So in order to try and combat some of this stuff. I started writing daily notes. About miscellaneous things, about what I did right, about what I did wrong, and to help communicate with her. I type them on my phone and then go home and write them out. I have slacked on writing, but I do keep up with it on my phone. My fiancee is annoyed that when I do go write it's to play catch up. She thinks I should only be posting relevant and current things, and that I should only put what's important (because even when writing I go a bit off topic, but it's so I can remember what happened that day. She also doesnt think this helps our relationship at all and she constantly says I waste her time and that I'm useless.

I love her with all my heart. I just need some recommendations on how I can work through some of these issues I have.