What can i do

Hi i know this is a long shot but i just need help so i moved from america to australia to get away from my biological father who was verbally and physically abusive towards me now since i moved to australia my mom has started dating again and got with a guy who is now currently my step dad so now i have a step brother and a step sister as well my step brother is always putting me down and calling out of my name and just belittles me. Now recently my step brother has been talking in my step dads ear about me and today my step dad has said that i am selfish self centered and that he basically didnt care about me .. now it hurts because i love my step dad and see him as my actual dad and would never think he would ever say that i try my hardest to make everyone happy and try my hardest to keep a smile on everyones faces i clean the house from top to bottom if my little step sister wants to play i make time for her if my step brother wants me to do things for him i always stop what im doing to help him out and i just dont know what to do so i can stop making my step dad upset with me or what i can do so he doesnt see me as selfish or self centerd im sorry if im asking for to much i usually wouldnt come online to ask for help but im honestly just at a lost