kindness always being taken for granted / looked at as a weakness

This is something I have recently been thinking about a lot again. Often people act like my kindness is something slightly negative. Or they take it for granted and act completely shocked when I react like they would for once 'because that‘s not your personality so it‘s weird.' I distinctly remember being around 12 and 13 years old and I tried so hard to turn myself into a kind person. Because I knew it was right, it just felt really hard to do sometimes. I would save all these quotes and stuff lol, and I remember needing to use sooo much self control to not snap at my friend because she was always triggeribg me a lot. I always tried to put myself in her shoes and tell myself it‘s not her fault. I think at some point it became natural to me or I just had finally internalized the belief that being kind and empathetic is the right choice usually. As I had lived through some rejection amd feeling very lonely myself I think that also made it easier.

And now, about 10 years later, I‘ve noticed that people always think I was born like this. I‘ve had friends tell me that they thought about why I‘m always able to make friends and they concluded that it must be because I’m so kind. But they said it in a belittling way, as if it was so easy, as if I‘m lucky to be a kind person. And yes, I can be a people pleaser because I found it hard to set boundaries to my kindness and put worth on my own feelings as well. But people always seem to point that out. My best friend once told me that people always take my side and not hers just because I‘m so kind always. Yeah, I‘m genuine and kind and that‘s why people have my back. And in that specific situation people tool my back because it was the right thing to do. Because you acted ridiculously. I am so tired of people criticising me for my kindness, even when I have given it to them so many times before as well. Acting like being kind is the easiest thing to be in this world, when in reality it takes a lot of strength and pain. Anyone else has this experience or similar ones??