Don't feel like a failure if your BP won't eat. Some just don't.
Where did you buy it, and have you reached out to the seller for help? How did the prior owner keep it? What was it eating and how many meals did it have before you bought it?
Have you checked that your husbandry is correct? Hot spot at 90*F, cool side 78-80*F, good humidity, small enclosure, lots of hides for security, etc?
FWIW what you're describing is assist feeding, not force feeding. With force feeding once the feeder is in the back of the snake's throat it's then manually pushed into the stomach using a long, thin rod; the snake doesn't swallow the prey item.