So im panicking a little PLEASE HELP

Ftm mom here, baby isnt even born yet. Im worried. I plan on breast feeding, but im worried that i will “over feed” her. Like they say usually every 2-3 hours they eat, but what if she ends up wanting more sooner? Or what if she doesnt want to eat every 2-3 hours and its more like ever 4-5 hours? Do i let her feed until she stops? What if she feeds for a really long time and i feel like she is taking in more than she should be? These are probably stupid questions but the closer i get to the due date the more worries im having of fucking something up😭