Only child vs. two

Only child here! My husband (1 of 4) and I have a 15 month old son. Growing up I was always so jealous of my cousins and friends for having siblings. They got to continue playing with each other while I went home by myself after being picked up. They have built in best fitness been now as adults. There were perks to being an only child sure but I always wanted a sibling sooo bad. So that brings me to being a mom of one currently. I love being a mom so much and I love my son more than anything but as I enter these toddler years I start to question if I have the patience or can handle two kids. But then I feel so guilty bc I know how I felt being an only child and I want my son to have a sibling. So I’m in this limbo. I know they say when you know you know and I guess I’m not really looking for any answers or solutions just wondering; has anyone else gone through this?