Why is the iPhone 16 battery life so bad??

I got my pink iphone 16 around the last week of January and just now started using it. While it was in the box, the battery was draining so quick. I thought that was pretty strange. These past two days I’ve been actually using it and the battery drains faster than a new phone should. Idk if it’s because the phone is new or something, but I don’t understand why they would make a phone so expensive and not fix this problem . Is it just me? Did I get a defective batch? My old iPhone 11 lowkey has a better battery life than this and if it wasn’t broken I honestly wouldn’t have upgraded.