Being black but looking white rant

So people tell me all the time that I can't be black because I look white. Because I don't talk like I'm black or act like it. I've had this all my life not fitting in with the black people because they think I'm white and always think I'm lying and I can't hang out with the white people because they know I'm black. My mother and my father are both black and so is the rest of my family. My great grandfather looks exactly like me but he's full black too. Only twice in my life has someone been able to tell just by looking at me. I've heard all kinds of bad names thrown my way from both sides. I've even lost friends because they "found out I was black" it breaks my heart that we live in a world like this. When I have kids they will most likely look like my mother because this gene skips a couple generations. I'm sure people will ask them if they're adopted or make fun of them like they did to me. I'm so sick of all the hate and resentment. Anyway sorry for the long rant just had to get it off my chest.