Feel like a failure

I’m really struggling today and could use some words of encouragement. My 3 month old baby boy is my first and only but is not an “easy” baby. He’s super fussy and doesn’t like to be put down in general. He eats every 1.5-2hours still (breastfed) and only sleeps for 1-3 hours at a time. I’m a single mom trying to do this alone and most days I love it. But today I can’t help but feel like I’m falling and worry that my child is unhappy. I don’t know what I’m doing wrong.