It takes some time, but you need to remember that you cannot change anything that has happened. It's done and over with. What you can change is how you deal with your drinking moving forward. Being sober and honest with yourself and others can go a long way in repairing some of the damage we've done. Also remember that there may be some people or some things you've done that can never be repaired, and that you have to accept that fact.
But you have the power to decide what happens today - that's the best you can do. Worry about that instead of things you have no control over.