I can't accept my own sexuality

I'm an 18 year old male and i will finish school soon. I will go to University then. Im so excited to meet new people and maybe to start my first relationship ever there. Also, I'm gay. I'm sure that my family would accept my sexuality, they are very tolerant. My mother even said once that she would accept that. But I can't accept the fact that I'm gay. I just don't want to be gay (no offense). I know that being gay is not a decision you make, you are born with your sexuality. I was never interested in girls since i can think. After watching gay porn, i feel guilty and embarrassed (again, no offense). I always have the feeling that i don't want to be gay but I can't change it. This feels very depressing and I can't handle that feeling. I never told anybody (except the internet) that I'm gay and i think nobody knows it. What should i do?Sorry for any mistakes, i had a bad English teacher