"Coming out" for Thanksgiving

My parents, my mom mostly, have always made it clear to me that they did not want me to be gay. I've had "pep talks" since I was a kid, reassuring me that I would not be gay despite what other people have said (ever since elementary up until college I was called gay or a girl by classmates). So it's definitely something I've been struggling with my entire life and has effected any attempt at a relationship with a guy. As a child I thought I'd grow out of it and did anything I could to come off as straight, and for a while I fooled others and even myself. I'm 22 now and it's been a little over a year that I've come out to my close friends and just recently been comfortable letting strangers know.I just feel the need to tell my parents so I can finally... feel free. I don't live with them, and honestly I have kept my distance and have avoided visiting them because I just feel too ashamed. I've come close to having "the talk" with them but always back out. Of course I have the support of my friends, but none of them really understand and I don't have any other gay friends.I guess what I'm really scared of is them treating me differently and not loving me as much as they do now. Did I mention I'm the only boy out of four girls. All I ever heard growing up was how much my mom wanted a boy and kept trying until she got one, me. My sisters know but never talk about it and have been questioning why I feel the need to tell my parents and even advised against it.So if there is any advice anyone could give, or some ideas on how to do it. I really want to do it soon so I can start the next year better than the rest. Muchas gracias.