UI looks perfect in emulator but breaks on real devices – need help

I always try to design my UI very carefully and make sure everything looks perfect. But sometimes when I test the app on real devices with different screen sizes, the layout completely breaks or looks messy. It gets really frustrating because I want my app to look good everywhere.

If anyone has tips or suggestions on how to handle UI issues across multiple screen sizes, please help me. I genuinely want to fix this problem and improve my UI skills.