Is it normal i feel a personal responsibility to take care of my friends?

I've noticed that with my friends, I almost treat them as if they are my children and feel a personal responsibility over them, like I need to take care of them. I have kept many toxic people around for this reason over the years, because I felt it was my responsibility to help them, even if it was impossible to.

I know that friendship is about caring and helping each other, but I tend to take it to another level and pretty much devote a great portion of my life to helping them, even if they don't really care or want it, and are unwilling to help themselves. I will keep doing it even if they hurt me over and over again and are toxic to me. I have just gotten to where I was able to recognize that this is a problem and that I'm allowing some of them to take advantage of me and hurt me, and I've come to the realization that you can't help everyone, especially if they are unwilling to accept it or to try and help themselves.

I've noticed a pattern in which I do it the most, and it's with my friends who have no one else and have no guidance, especially those with no parents or ones who don't care about them. I feel that as a friend, it is my job to be there for them, which it is, but I take on way more than I can or should handle. The weird thing about my tendency to "mother" my friends is that I am a childless 24yo and all of them are around my age or slightly older. I really love helping people, especially those I care about, and it's hard for me to watch them struggle, but at the same time, I let my life go by the wayside and abandon my hopes and dreams to help people who don't want it.

Does anyone else have this issue?