New to birth control

Hi everyone! I just started taking birth control pills three days ago. I kind of did A LOT of research and have started to freak myself out about negative side affects (weight gain, irritability, acne) and I'm starting to become extremely freaked out. I feel as if everyone who comments their experience with birth control says it was bad which I don't understand since it's so popularly taken...How was your experience? And should I be this worried/nervous?