Please help!!

So I’ve made it one month breastfeeding my son! I wanted to give up multiple times and I’ve even given him a bottle with the intent of quitting. But i stuck through it. He was born at 8lbs 8oz and at his 4 week checkup he was 11lbs 2oz!

But now I’m worried because he only eats about 5-10 minute only on one boob. It’s steadily going down with the time he eats. When he was first born he’d eat for 30-40 minutes. Then it went down to 15-20 minutes and then 5-10 minutes and now for the last few days I’m lucky to get him to eat for 5 minutes. He’s peeing and pooping a lot. But he doesn’t seem satisfied after eating for the 5 minutes, but will keep pulling away from the breast or fuss while eating if I offer it to him again. I don’t know what to do. There’s no LC’s near me and his pediatrician said as long as he’s gaining weight it’s fine. But I don’t think it’s fine if he doesn’t seem satisfied after eating? Anyone else’s baby do this?