I think it’s pretty normal to hold yourself to a standard you don’t impose on others, and I do think it’s somewhat problematic, like perfectionism is. If you get mad at yourself for messing up and not being inhumanly perfect then yeah that’s not good. You are a person too, and should give yourself consideration.
If you just mean you try to think before you act and consider how your words and actions affect others, I would hope everyone does that!
That stuff all sounds nice, I would just say to make sure you don’t burn yourself out of keep others from reciprocating your kindness.
I’m not that nice, though we do sometimes let homeless people stay, always have because we know some, I am happier when the workload at home is balanced between us, wouldn’t intervene in a fight because that’s too dangerous.
So I think if you are doing things to be selfless, like at the expense of yourself, watch out. As I noted in my original reply, you need to take care of yourself too, giving too much doesn’t work out better for anyone. You are a person too, just like the people you are trying to help.