<human>: Early in my parents marriage my father began having affairs. 
I was born about a year into their marriage, and three half siblings shortly followed. I met one while I was in kindercare and that half-sibling has pretty much been a constant in my life since. I didn't meet the other two until four years ago. 

I've always put on a nice face in regards to them, as I HATE hurting feelings, but I can't seem to accept ANY of my half siblings. My parents are still married and even had two more kids together but I see how my father's infidelity has affected my mother even as she tries to take the high road, she's mentioned it enough in my lifetime for me to know it bothers her more than she lets on. For me, my half siblings are like a living reminder of both my mother's hurt, and ESPECIALLY my father's infidelity. My dad is always getting us all together for events as if we're one happy, *normal* family and I am tired of it. 

I've spoken to therapists about this to no avail. I don't hate my half-siblings but If I could cut all contact without looking like an a-hole I would, I'm in fact actively looking for a way to do that. 

Am I wrong for feeling this way after all this time?

Can you give me the gist of the text in a nutshell?
<bot>: Years into adulthood, I still can't accept my three half-siblings resulting from my father's infidelity. I feel guilty because they aren't responsible here, but would still like to sever contact. Understandable?