If you're not ready to get married, don't grab at a relationship. Patiently wait for the right time to start one that can eventually lead to marriage. If you're ready for marriage and you're in a relationship, don't let impatience cause you to rush. Take your time. Enjoy where God has the two of you right now.
When we define our happiness by some point in the future, it will never arrive. We'll keep waiting until tomorrow. If we allow impatience to govern us, we will miss the gift of the moment. We'll arrive at that point in time we expected to provide fulfillment and find it lacking.