It will only overshadow the day if you let it. There are so many things you could be focusing on. You're getting married! You have friends and family there. It will be wonderful in ways you can't even imagine yet. It will be the happiest day of your life.
And the fact that you don't drink, makes it even better! You can drink any type of non-alcoholic beverages and think: "Look at me. Sober. Getting married. Life is wonderful."
And the fact that the people who support you are right there... does it get any better? It sounds like the perfect wedding to me. There will be no shadow.