I'm thinking of coming out to my extended family even though my parents don't want me to come out.
Could you explain to me why you want to come out?
Yes, I don't want to hide these things about me anymore and I want to be myself around others.
You are in charge of your own identity and it is acceptable to decide who and who does not need to know about your sexual preferences. It's perfectly acceptable to want to come out to people in your family even if others do not want you doing so. Your family members should support you no matter what and they need to work on being more open minded if your sexual preferences bothers them.
I don't know if they will come around. I'm really afraid of their disappointment and how they will react.
You should embrace your differences and not be afraid to speak about them, if your family doesn't understand then you will need to have a serious conversation with them. No one should be afraid of who they are and what they like, so long as it is legal.