Overlooked & Unacknowledged

I don't know why it gets under my skin so much, but dealing with a man who has children makes me feel out of place. I mean, I get it. I'm this new person from out of nowhere and I expect them to be open with me and know enough that they can speak comfortably with me about anything. It's not like we are complete strangers... I see them daily and we shoot the shit every now and then. But I just feel like a bond will never be built. Maybe it's because they are teenagers and the role of "Parent" is already taken, but I find the younger children to be much more accepting and easier to build with.

Like I said, I don't know why I feel some kind of way about it, some people would say it isn't that serious, but I am a sensitive person. And honestly, my feelings were really hurt. There was even one time some asked the teenage girl if I was her mom, and she responded in a kind of disgusted way. Like, "No... [eww]". Then I see how they are with other adults in their lives and I am basically treated like nothing. They were even asked about who they had the most fun with, and the response was "driving around" with a psycho. Meanwhile, I had just took them to the fair and did the most. Maybe we just have different ideas of what "fun" is. Either that, or these kids nowadays are just unappreciative to the utmost degree.

Only thing that gives me strength and perseverance in the situation is my relationship with the dad. Should I just give up on caring with these kids and just worry about the dad? Or continue to be kind, gentle, and the unappreciated out of respect for my guy?? Can anyone relate?