Have you ever found yourself in the middle of explaining your reasons for not doing something, or apologizing for not being able to oblige someone else's wishes with your heart beating, and sweat building on your forehead? You can feel their disappointment, and it feels awful. If you're speaking to them the look on their face, and skillful interruptions may guilt you into caving. If it's a text based interaction the breathing space may allow you enough room to escape the guilt enough to stick to your convictions.
If any of that sounds familiar, you may be a people pleaser, or perhaps just someone who is socially gullible in a sense. Maybe, a good mixture of the two.
There's a lot of ways a person can arrive at the role of being someone who falls prey to pushy people who tend to take advantage