Im sad lonely and hiding my real feelings...how can I be set free?

I have moved to australia to be with my cousin and his wife. I love sydney and all its a nice place. I moved from new zealand about a week ago. the apartment is nice and stuff to. I have moved out of my fathers house. my father was very abusive towards me and my family. anyhow taking the risk, I decided to move for a change and a chance at life. my cousin is my fathers neice. but i have somehow fallen into a depression. I dont feel comftable being around negative dull people who are just so controlling and self obsessed. it makes me sad to see my dads side of the family like this. my aunt zosia was very rude to my cousins wife when she first got married to him. she was so rude to her and made her feel like she wasnt even noticed. my cousin is nice but he seems to have a dull side to him, he seems to make me feel uncomfy and just depressed. I feel like I dont maintain a good relationship with him. he says rude things to me and always tells me im wrong and I cant do this or go there bla bla. im 21 years old and I am from NZ. I told him im saving to go to america cuse its a dream for me to visit the usa. then he got mad and said only stupid people waste money there. I was very offended and thought how selfish of someone to say ya know. also hes not really caring he thinks about himself only, just like my dad. it puts me off being around my family on my dads side. alone my relationship with my own father is non existant. everyone back at home says im so lucky too be in australia but I feel like losing hope. I feel really sad being with my cousin. I love his wife she is a lovely person. I also miss so many friends overseas in usa and canada, and my sister monica in new zealand. nobody knows how I feel yet. my feelings are hidden. not even my best friend knows yet :( I feel so sad inside. I feel confused and dont know what to do. I have 2 aunts living in australia. my aunt sally is in sydney hehe yeah the same name as me, and my aunt jenny in brisbane and my cousin. they dont know how I feel. I got 1 friend mirna shes lovely too. im scared if I tell my family and friends theyll get stressed out and Ill make them sad :( I dont wanna make them sad. Ive been crying every nite. please help im lost im sad and lonely.