Gil,
Now, that helps. Let me give you my thoughts. Loving movies and standing at a counter all day handing over videos to custamers are very different things. I would suggest that you get a part time job at a video store after you're done at the bakery. My guess is, that you will find the job at the video store to be very boring compared to the bakery.
I don't think you have to "prove yourself". I think you should be proud to take over the business. There is nothing that makes a father prouder than to see his son follow in his footsteps. I wish I had been so lucky as you when I was a young man.