I'd say to some extent I'm a people pleaser. I'm not entirely sure of the primary reason for it, but I think it basically comes down to the fact that I'm happy when I know others are happy with me, so by pleasing others I am also pleasing myself, so I suppose it's a win-win situation most of the time.
I also sometimes have difficulty when it comes to pleasing others who I think view me negatively because of a disagreement we have. I feel like I need to 'make up' for disagreeing with them, in some cases at least. I've found that I often find it difficult to stop and tell myself that not everyone has to like me and agree with me, and I've recently found myself using a weird method to calm myself down: thinking of the fact that in movies, the villain or bad guy never likes the hero, so if I'm to be a good, rounded person I cannot expect people who have different perspectives than me to like me and agree with me all the time because then that would mean I'd be going against what is "good" from my perspective, and thinking about this usually helps me relax and not be so concerned with pleasing someone who I'm finding it difficult to please because of a disagreement.
I also read an article once about how maybe some 'people pleasers' are this way because of a deep, unconscious fear of being in danger from that person, so maybe that's a factor too somehow.
But yes, I do try to please others to a certain extent. If it becomes unhealthy or unsafe I think I know when to draw the line, although I haven't exactly had much experience with this thankfully.