This is my first post so plz bear with me....I have been with my b/f now for almost two years and we have a daughter together who is now 10mths old (our baby was not planned and we fell VERY early into our relationship)

My b/f also has a 10yr old daughter, he split with her BM 9 years ago and has also had a long term relationship with another woman since.

He introduced me to her after a few months and on the occasion that I saw her, we seemed to get on well. I moved into my b/f's home once our baby was born and for the first few weeks everything was ok but now life has become almost unbearable. I feel like a stranger in my own home and that i walk on eggshells every day. We (SD and me)rarely speak to each other and I am now at the point where even the sound of her coming in the front door annoys me.....I don't want to feel like this but I don't know whats caused it either.

I have tried to keep these feelings to myself but the more i do this the more angry it makes me and then I feel I am lashing out at my b/f when I know its not his fault.

There are issues around the house that make me feel uncomfortable too i.e. she walks into our bedroom whenever she likes and uses the en-suite shower instead of the family bathroom, she comes in the bedroom when my b/f is naked also which i think is totally wrong at her age. She never helps around the house and gets away with it.

I am really at the end of my rope now and don't know what to do..

HELP!!!