I’m 18 and I have had NO breast development. Help!

To fully answer this question, it depends on where you are in puberty — but don’t panic. It’s possible you’re just a little late to puberty, and you can tell depending on if/how long you’ve had your period. If it’s been a year or two after your period started you’re likely done growing, but it also helps to look at the females in your family to determine how realistically big your breasts should be. They may just be small, and that’s okay! If you have concerns about late puberty chat with your doc.