Would you tell people he was your father?

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I grew up not knowing my father. Although I know he spent some time with me and my mom, he just visited not even overnight and not even that often. All this I can vaguely remember as a very young child and he stopped visiting maybe before I was ten. During that time I only thought he was out of the country working. Not until I was ten was I told that he had a family with 3 children, two are older than I, I was his third child and another followed. What's more awkward is his youngest child is less than one year younger than me and we almost were in the same university. As for "my" older siblings, one 2 years older the other 3 years older, we have common friends and I am often associated with them because I also carry the family name. And since the family is very prominent (and the lineage is small), I am always asked about them. And again, all this time I have kept to myself, within my own circle of friends and the things I do, I have led a happy simple life, far from the riches of the dad that has tried to deny me these past few years and the spoiled life I might have led. Now that I have graduated and working, would it be rude for me to admit that he is my father? I mean, for all the years that I have been studying, I'd get asked about him but I try to deny knowing them for the fear of being "found out". Just thinking of the possible repercussions of other people knowing makes me feel that it's a secret I should always keep. But then it's not a burden I don't want to carry anymore. I don't even know if my half-brothers and half sister know about me. My cousin even told me that I should introduce myself to my half-siblings just for them to find out. All I know is that I have turned out a better person, growing up with my mom, and my step-dad and younger brother, and I hope he gets the message, I'm better off without him.