Bike size really matters. When I get back to riding I bought a cheap bike. I'm 5 foot 7 little Asian. The charts all tell me I am a size M. For some reason, other bike shops I've tried also suggested size M to me before I bought my cheap US$200 bike. Yes, 5 foot 7 is usually size M. But for size S I am also ok. I am in between.
I can not stand on the size M on both my feet, the top tube will be in my crotch area. Not even sitting on the saddle. I didn't learn much about bike geometry. I hadn't ridden a bike for a while and I thought bikes will all be well made by now. I bought the best looking bike from the internet ordered from mainland China. With 3 spokes wheels that look like it is made with plastic. I went for looks. It was way too big. The saddle had to be at its lowest point for me to ride. The handle bar was too far.
Ended up using this bike to learn about all the parts and geometry before upgrading to a much better bike and brand.

Look at other bikers. When they peddle standing up, their chin can easily pass the handle bar or pointing straight down at head tube area when they are grinding hard. Can you do that on your bike? If not, it is way too far. It is odd that vendors go for bigger instead of smaller when they measure you. As kids we all probably remember trying to ride on an adult bike that is too big. It doesn't really work and can be dangerous. You can be too big and ride on a teenager's bike that is smaller and feel comfortable. So after this experience I insisted I wanted a size small. And now I love my bike.