Do you think I'm a terrible pet owner?
Why are you asking me if I think you're a terrible pet owner?
My dog doesn't seem to like me very much. I must be a bad pet parent.
Your dog may just have a different personality and doesn't display as much affection towards you as you would like. That doesn't mean you're not doing a good job. If your pet is healthy and provided for and not neglected, that's all that matters.
I don't understand why he doesn't like me after everything I've done for him.
Are you spending time walking and playing with your dog? Maybe you need more bonding time together? Don't give up, it just takes time and simply providing basic needs for your pet doesn't guarantee their love and devotion to you.