So everyone hates me. So I have like 2 friends all of the other people I was friends with I had fights with and am no longer friends with and the other people that I talk to don't really want to be friends with me, I'm just a last choice to them. My sister all ways makes fun of me and gets mad at me. My dad thinks that everything I do is stupid and pointless (I play a lot of video games.) I also have misophonia, here's a link if you would like to know more- http://www.misophonia.com/symptoms-triggers/ -I will try to sum up what it is though. Pretty much certain sounds like people chewing (which is the kind I have) will make you feel anger and a panic attack at the same time. Well pretty much I have that and my Dad thinks that I have mental problems and he thinks I am going to be a serial killer. And anytime I get into a fight with my sister (which is like every day) he always takes her side even if he doesn't know what is happening. Last thing is no one wants to go out with me every person I like always thinks I'm weird or just doesn't care. I really don't know what to do about it anymore.

I don't hate you. And I don't really think other people hate you either. You're the main character in your life, but definitely not in anyone else's (maybe, I don't know). Some people may just be busy with their own life and their own crisis's that they don't give another thought to you. You're just another passerby in their lives. Just like I will be in yours.
Now addressing the concerns within your Paragragh:

You have like 2 friends, that's normal. Most people can count the number of real friends they have, on just one hand. 2 is normal. Getting in fights with friends.... maybe not a good thing. Being last choice to other people, normal. I'm probably not the first choice to you am I? No. Because we don't know eachother, you wouldn't be my first choice either, I don't even know you or your real name. That's normal. Fighting with siblings, normal. I have four siblings, we get a long, but we definitely fight sometimes too. Parents picking favorites, normal. As much as you wouldn't want it to be, that's normal in families. Misophonia, hey, I have Epilepsy, my parents also don't understand it nor why I have it. Some people are just not well-informed. Dating, getting rejected, normal. I was rejected multiple times (like 7 or 8) and have only had one girlfriend and honestly, that relationship went downhill so fast it didn't even last a month. I wasn't as ready as I thought I was. When I get into/ want to get into a relationship I usually try to friendzone the person I like first, get to know them, and then if I actually like them, then I will ask them out. Most of the time, it turns out I wouldn't want to date the person because they were not how I initially thought, but atleast I make a new friend out of it.

<<2
When I say I am picked last it is by people who say they are my friends.

>>3 OH... Well in that case, You just may not be a close friend to them. Maybe they have other closer friends. To you they may be your closer friends, but to them, you probably aren't. It's fine for you to put them first, but them to put you first may take some time. just treat them the way you want to be treated, and overtime you'll know whether or not they really are your friends.

honestly prove them wrong try changing yourself to something better to prove something that you arent completely useless. The world has rejected you so you resorted to playing video games a lot to isolate yourself of the cruel reality but yet again the only way you can live the life you wantis to learn how to live independently, enduring and able to keep on breaking challenges. You can do this if you want to, and hope not regret any decisions you'd make. Do this if you want to, or need to

>>5
It is the absolute worst to tell someone they need to change themselves just to help someone else.

Disagreed with >>5 Yes Im being just that consistent.
Basically you shouldnt change who you are, even if it is to get liked by everyone else. But, yes but, you should find something that you enjoy, pursue it, and build up your confidence. Dont be afraid of experimenting with who you are to yourself and to others, changing that around a bit and see what works out. The impression you currently give is obviously not the best. Just dont hide who you are, rediscover and/or reinvent it and do it with more confidence.

Let me fix what I said up there because seems to be focusing on the main points. I am fine with people more people talk to me now but I don't get why some people say they are my friend and don't actually mean it. Also my family hates me and I have depression and confidence/social issues because of my dad who thinks I am going to be a serial killer

I have misophonia as well so I can relate to you when it comes to the friends side of things. (I especially cannot stand it when you can hear someone else's phone vibrate constantly whilst out to eat, but I digress)The main issue I see isn't that your friends don't trust you because they do (I know from experience that they don't act like it, but they seriously do), but the problem of your father not trusting you. I personally have never dealt with this, so the only thing I can really recommend is to sit down and talk to him. Not the best advice I know.