Birth control newbie

I'm 23 and going to start being sexually active probably soon...thinking about what I'm going to do for birth control.

What are the side effects you've experienced with the pill? I've read all the statistics on effectiveness of this vs. that but in the end I want to know which method makes you feel the safest and not have to guess or worry.

Does having sex stress you out knowing theres a chance of pregnancy? I don't want to be walking around all day paranoid.

Any advice appreciated :)