I love being a dad, but that doesn't mean it doesn't have its difficulties. Like when my son comes into my bed after having a bad dream and I have to worry about him rolling off the side somehow. Or his need to take whatever food I give him and mush it into the carpet, or try and drink whatever scalding hot beverage I'm sipping on.
Being a dad is basically trying to protect your kid from killing themselves all the time. And raising them to not be monsters.
If it sounds like its difficult, it's because it is. Don't get me wrong, it's extremely rewarding, but hard as hell.