IUD? Experiences

So I’ve been trying different birth control pills and researching different method and im really at a loss what to use as birth control. Honestly all the options scare me since all of them can have pretty bad side effects. Lately I’ve been looking more and more into iUDs. They used to be the method that scared me the most but with all my research I think it might now be something I’d like to try. I think I’d go with the mirena if I tried it. Please share your experiences with me, I’m quite scared of it moving out of place or falling out or I hear there’s a string, could it accidentally get pulled??