I am a codependent, people pleaser. I hate it. I cannot say no to people even if the world depended on it. I feel like other people are my responsibility even though I know they are ultimately responsible for themselves. I do not like conflict so I agree to anything to avoid conflict or someone being mad at me. I get resentful after the deed is done. I hate who I am, and the way I have been conditioned to behave.
Alot of my codependency and people pleasing habits come from my childhood abuse. Therapy seems to help, I recommend the same for you. Having a safe space to share your thoughts and feelings will help you a bit.