just needed to vent sorry long post. don't have many friends at all to talk to

I am so aggravated and pissed with my SO. I am not even looking forward to thebbaby shower this weekend due to my sister in law. I absolutely hate her. Since day one she has had animosity towards me and her reason is because I have an attitude. I have done nothing to her. This is when it all started.  She comes over with her teenager and lets her do whatever in our house. Run in and out of the house while the ac is running and it's summer. Going into the bathroom to look in the mirror every 5 mins. I was already in a foul mood that day because they decided to come over and drop of a dog. Unaware of not knowing that they were going to do that. It pissed me off because you can't just drop off a dog when someone else already has a pack and expect it to go good.  That is a very dangerous situation. Not good for animals or people. New dogs have to be introduced slowly and precautions have to be made. Not only that but the simple fact we were unprepared for the dog. That was the day that her daughter was there doing whatever the hell she wanted. I finally had enough and told her daughter that she either needed to stay in the house or outside to quit coming in and out. Well when they left I found out my sister in law was talking crap about me. This has been going on for almost a year now and I am beyond fed up with it. Simple fact that she talks crap, always starts stuff, and is always full of drama. I am high risk now and have told my SO that this has been going on long enough and I am fed up with it. That it needs to end now. No one has to sit here and deal with the shit. Excuse my language. My SO is inbetween all of this and feel like it has to choose sides. That isn't it. I don't see my sister in law unless she wants something or at family get together which she gives me dirty stares and snide remarks. I honestly could care less about her and her kid. I like to be drama free. I don't even deal with my family crap. They have reunions and I go to them and leave the drama there. I don't even deal with drama from my brother. You can still be family and not deal with the shit. I just want to enjoy my baby shower with all my friends and other people. Stress free. Just this once. I am getting to the point where I will shut down my emotions and stuff to protect myself and my unborn child.