2 month old and 2 year old.. this is hard

In the beginning I expected it to be hard but my husband had the first 6 weeks off so we were 1 on 1 coverage for the kids. Now I have them both. Our 2 year old has gone on a nap strike and not interested in doing things for the baby with me. My 10 week old is having a hard time napping on their own, likely due to the small house and the incredible volume level of our 2 year old. I often have to leave 1 to tend to the other. Many times they will need something at the same time and it leaves 1 crying. I feel like I’m not able to pay attention to either the way I would want to. Why does this feel so hard?!? Am I doing this all wrong?! Anyone else struggling with this new role of mom to 2? People have way more than 2 kids and seem to have it together better than me..