Should I refrain from having children?

I am babysitting my friends kids and they are little brats. I've always wanted children of my own but I'm starting to reconsider whether or not I like children. For example, when you've done everything you can to make a baby comfortable and it still cries. I don't know if I could deal with it. Has anyone else felt this way and had a different experience when raising YOUR OWN children as opposed to caring for someone else's kids?