Let me start out by saying YOU DO NOT HAVE TO WRITE YOUR OWN VOWS!
The pressure to perform can make a beautiful moment very stressful for some folks. Your officiant should have lovely repeat after me options for you. #dontstress
For those who do want to write their own vows, here is an easy way to get started. I tell my couples to start with two sentences about how you felt when you first met, two sentences about how you feel now getting married, and two sentences about your vision for the future. Follow it with some simple "I vow to..." lines that will help manifest that future vision. The prompts here will help get your brain moving in the right direction. Check out my I Promise To... Pinterest board for inspo