Are there any support groups for people who were molested by their fathers when they were younger?

Yes: I am sorry to hear the circumstances behind this question; and support group(s) can be an integral part of a comprehensive treatment plan; both supportively and therapeutically. I do not know where you hail from so i would refer you to your local physician, mental health provider, health insurance company and/or medical society as they can point you in the right direction!

Survivors of Incest : Consider survivors of incest anonymous and/or incest survivors anonymous, two twelve step programs for survivors of sexual abuse.

Try here too: http://www.rainn.org/get-help or http://www.Ascasupport.Org/ for more information on local support groups for support.