My cat hates everyone but me

I have a 9month old female kitten who hasn't always been so pleasant. Since the first day I got her she hissed upon coming out of her crate granted I shoulda let her out on her own I hadn't. Since then months go down the road and she now hisses at my boyfriend mainly and runs from him low to the ground like a,rat around my house. She'll hide from him and anyone else even me till she knows it's me. If she hears his voice she Tourette meows and scuttles away n hides.....someone please tell me why shes like this

Do you have any background information on this cat?  Could she have been in an abusive environment before she was adopted into your home?

The reason I am asking that is because I had a cat that was physically abused before she was abandoned in a friend's truck. I think the only reason my friend was able to pick her up to bring her inside is that she was too cold and/or scared to fight with him.  She would not let me touch her with my friends in their apartment.  I asked them to please go run some errands for a while.  I sat on the floor in their apartment and just talked to her.  She finally came out from behind the couch and I was able to lure her into the carrier with a can of wet food they had left for me.  I took her to the vet the next day because she was limping and her back leg had an obvious infection. The vet drained the infection and cleaned the area.  She was given an antibiotic injection. She was scared of men.  The vet I went to was a multi-vet practice and the first vet to walk in the room was a male and he could not touch her.  She screamed and turned into a hissing ball.  This vet did nothing wrong and had treated my other cats before.  He left the room and asked a female vet to take over the appointment.  The female vet and I sat on the floor and talked to my cat until she calmed down.  She let the female vet treat her without a problem. The female vet noticed obvious signs of physical abuse and asked me how I had ended up with this cat.  I told her what happened and the vet felt she had been abused by a male.  I had two roommates at the time and one of them was a male friend.  The vet advised me to tell my male roommate to ignore the cat until she decided to initiate contact.  Fortunately my roommate understood the situation and listened to me.  It took about 2 months before she would go into a room he was in.  It took another 4 months before she would allow him to pet her. My roommate loved cats and just interacted with the other cats until she was ready. It is very possible that this could be what you are dealing with here.  I would suggest having your boyfriend ignore the cat and let her dictate the terms and pace at which they bond.  My Baby-T was so tiny when I adopted her that I thought she was a young kitten.  She was almost two years old.

My cat also would hide from me until she recognized my voice and it took over a year before she stopped hiding from strangers.  Some cats are also just shy and hide from strangers.  One of my cats will not let anyone see her except for us. She hides under the bed when we have company and will only come out when they are sleeping. If I have company for a few days I move a litter box upstairs and set up her food/water upstairs in my master bathroom area too.

He usually does ignore her but he says it just bothers him she's not like a normal pet. No one can bother with her but me.....but I think he's jealous of our bond. And that she never hisses at me or really runs from me lol. I think she isn't fond of him because he tantalize's her plus she can sense he's not a cat person.

After working with abused kittens i would say she sounds abused. Here is what I suggest.
Isolate cat to a quite room. For 1 hr go into the room with treats. Give her the treats only after she lets you pet her. As she gets more and more comfortable spend more time with her or let her out for a few hours. Eventually she's going to associate positive with human touch instead of negative.
This worked wonders with my strays however I havent tried it with a kitten older than 6 months so it may take longer.