If you don’t end things when you feel you should, you will explode and make things a hundred times worse. It’s so much better to address things early, even if you are incredibly scared. If it will ruin your relationship when you discuss it early on, it will definitely destroy your relationship when you can no longer keep your frustration to yourself.
Doing what you are most scared of is not always a good idea. If you feel like you aren’t ready for something, you might actually not be ready. Rome wasn’t built in a day and neither will your mindset. Don’t skip the baby steps if you feel like you need them.
Stand up for yourself. Other people will try to help, cherish them, but in the end, the only person who can make your life better is you.