I think it’s safe for me to say that your ADD isn’t your problem. In fact, most of the creative people I know say they have ADD. Those who are successful have found ways to make it work for them. They have developed ways to work around it when they have to meet deadlines but, generally, they enjoy the creativity, spontaneity and multi-faceted thinking that comes with it.
I think your problem is your reluctance to pick something and run with it. You won’t know what will ignite your passions until you get involved. Clearly there is something about film and the arts that hooks your interest enough that you went to school for it. Trust that for now. Don’t worry about excelling. Just get some experience.
If you don’t know how to manage the ADD, see a mental health counselor for some help with it. There are practical ways around it so it can be a plus in your life instead of a problem.
I wish you well.