My family is pissed off with me

I still live at home. I'm due the second week of October. I've got my mom, dad, younger brother and younger sister in the house. Sure you can't pick your family. But my sister is one of the most obnoxious people I know. Shes 16 and i am 20. She drives me insane. Even before I got pregnant. We've never gotten along. We always fight and butt heads. She truly believes that she is better than everyone and takes no responsibility for her actions. This past month alone she's gotten on my last nerve. She went into my room a week ago, took my makeup without asking, then took my bag of makeup to her school and shared it amongst her little friends. I don't wear makeup every day. Normally just on the weekends. So Saturday comes around and I'm like I can't find my makeup. Lo and behold she confesses to taking it from my room and instead of saying sorry for stealing your makeup she tells me "I'm a teenager. I'm allowed to be a rebel. I can do what I want." And my parents for the record, sided with her. And I had to toss all of my makeup because GERMS. I don't know who she shared my stuff with!!! And the week before that I was really dehydrated and couldn't keep anything down. The doctor suggested Gatorade to replenish my sugars and stuff. So I went out and bought myself a little 6 pack of Gatorade. I announced to the family that I had bought this and please don't touch. The next day, it's all gone. Where? My sister decided to take all six to her soccer practice and share it with her friends. And yet again my parents insisted she did nothing wrong. I bought a bunch of body lotions and washes and soaps from bath and body works. My collection of peach scented stuff is now in her room because she likes the smell so it's ok that she takes it and keeps it even though I bought it and it was in my bathroom. And I'm supposed to be a good big sister and share and sacrifice for family. Today she came home from school and just insulted me. Asking me why my cankles are so big. Why I'm tired because I'm so lazy. Telling me my belly is retardedly shaped. I said shut up and got in trouble. Later on tonight she went to hug me goodnight and I pushed her away and said don't touch me. Now my parents hate me and think I'm so horrible and unloving towards her. Please just note I'm not a hugger. I don't hug people EVER. I've always been this way. I'm not touchy feely. But to push my buttons she pretends to want to hug me, knowing my first instinct is to say no and push away. And now no one is talking to me. I'm so frustrated.