Sparkling, I think you will have great success by looking differently at the outcome you want to achieve!
Firstly, you say you’ve been told to lose 20lbs. I imagine this is for medical reasons. So, reframe that to “I want to be 20lbs lighter, which will really improve my health. I’m doing this for me - and it’s going to help me feel and look my best.”
Focus on what you will gain, not lose. We humans don’t like loss, we seek more of everything!
Processed food is not satisfying. If you add whole foods daily you truly will find them much more filling. Supermarkets only offer minimal wholefood offerings (because their profits come from the unhealthy stuff!) so I’d suggest finding a good online supplier.
Watch the recent BBC programme called What are we feeding our kids?, presented by Dr Chris van Tulleken. He used himself as a junk/processed food guinea pig for a month and the results were shocking!
I think if you make new and different food choices because you want better for yourself, you will be surprised and pleased at the shift in your mindset - and the scales. You also won’t be hungry! I wish you success.