Rant!!

I am pregnant, 17 years of age. Now I'm upset, not the fact I'm pregnant, maybe a lil only because my parents are literally going to disown me and call me harsh names because I got pregnant at such a young age.  and not even let me get a say in if I can keep the baby or not. This actually upsets me dearly. I know I'm young, but I have a young sister who is 3 who I've looked after & I really like being a mother figure. but can't I get a say in what I want? Or have some respect or some support? Id be a single mother and I'd feel bad for the baby. I'm unsure what to do, I hate that my parents won't support me through this. :(