Every marriage experiences challenges at one time or another. There is no such thing as a perfect marriage.
Many couples get stuck in their struggles and just can't work out their differences on their own.
Such differences are not the issue, the real issue is how you're dealing with your differences.
Relationship issues that go on unresolved will eventually lead to relationship breakdown. In the event of relationship breakdown it will be a lot harder to work through issues that have been left to fester for a long time.