Think that when we attempt to please everyone around us, it's often so that people will like us. Think it might be one of the masks we wear in neurotypical land. Or it's something that we've learned to do in childhood.
Looking for outside validation from others, puts a lot of stress on you. It also depletes the time you have for yourself to recover from daily life, causing depression. I used to be like that as well. There are some things you have to practice doing, even if it feels bad at first.
Realize that you have the ability to make a choice. And give yourself time to think about it. An hour, a day a week.
Don't agree to anything without saying "I'll have to think about it." If someone pressures you, than automatically say no.
Practice saying no to people who usually expect you to say yes. You can change your mind if you decide to later.
Agree then use a time constraint: I can only do this between this time and this time, on this day.
Never apologize to someone or give excuses for saying no.