Just scheduled my appointment for an IUD...I'm not sure anymore.

My boyfriend and I want a good birth control, because we're both only 18 and definitely do not want a baby. He's been saying an IUD is a good choice, and so I made the appointment for next month. But I'm really nervous now, the doctor didnt mention all the side effects that come along with it, which I researched and I'm kinda scared now. I'm not sure I'm ready to do this anymore, but I feel like my bf is gonna be annoyed with me, we both dislike using condoms every time. Any of your experiences with the IUD or other forms of birth control are very much needed rn lol.