Should I stop fostering?

It sounds to me like the placements just weren't there long enough for you to really bond. In reality, you WERE babysitting. I would give it some time. I feel like I'm babysitting even after bonding at certain times. Such as when MY baby is fast asleep but my FB is up in the middle of the night. It's normal IMO.As long as you can show affection and empathize, "fake it till you make it." With a long enough placement, bonding should be easier. Good luck!