Picked on, sister rivalries, trust issues?

Too much stress. My sister and nephew have been living here with us for awhile now and i can certainly say, i am having a hard time adjusting to it. I thought it would be fun. And there were times when it was but to be honest, if someone doesnt leave soon, then i will have to leave. My sister feels like she has to put her two cents in when it com es to my life, she has to be bossy, like shes a mother hen. She tries to tell me how to live my life and her advice doesnt work for me. I have a good head on my shoulders, i think i know whats best for me. i'm just sick of it all.  My relationship with my mom has got me questioning things. Trust has always been a quality i look for in any relationship i'm in. I always thought i could trust my mom, but she has the tendency to embarass me and talk to others behind my back.  Ever since my sister walked into the house, my mom has showed favortism towards her, and has more of a relationship with her than me and my younger sister. I love my mom but i cant help but think i'll be alot happier once i get out there and live on my own. I'm the only one in the house who everyone picks on and truth be told, i rather be on my own then put up with this nonsense. I dont know what to do anymore. Thankgoodness i have a session wiith my counselor coming up.