Am I overreacting for hating my uncle?

My father and uncle had fought back years ago for something and never have spoke again. Dad never told me why and even now that I'm 18. Years ago I tried a few times to say hi to uncle whenever I walked past him but he ignored me like I wasn't even there. Now whenever I see him talk with his friends and I walk past them to go home I see them smiling while looking at me and I feel like he's mocking me. It's feels so irritating and uncomfortable.