Don't be afraid of conflict. Conflict, managed well, is a part of any healthy relationship. It's not about striving to suppress the differences, but communicating in such a way that the differences can be accepted, and maybe even embraced.
If it's not worth breaking up over, then it's not worth arguing over. If you’re arguing every other day, you’re not in a relationship, you’re on a debate team. Not every concern needs to be an issue. Let the insignificant things stay that way.