molested by family member

I am scared to tell my mom I was sexual abused by a family member when I was smaller, I didn't want to say anything because I didn't want to destroy the family, but now I am 17 and I want to take therapy because I can't have sex or be sexualy active with my partner because I get flash backs and they make me sick, and I am tierd of being selfless and not thinking about myself and my happiness just for the happiness of my uncle.