In order to feel good about having money you have to use a little of your imagination. Think about how it would feel to have millions of dollars at your disposal. What would be some of the feelings you would have? Happiness, joy, feelings of freedom, feelings of security, confidence, etc. Once you start to understand what feelings you would have just pretend like you have the money and manifest those feelings inside yourself.
If that is hard to do just think of something that makes you happy, like maybe going to the park with a friend. When you get that happy feeling inside you just change the scenario to imagining going shopping with your friend and not having any spending limits. Hope that helps.