Help me?!

This is the third day that I’ve been home with my newborn and I noticed that my breast milk wasn’t coming in yet. But today my breast are super sore to the touch. And milk isn’t coming out as much. Idk if it’s mastitis or clogged ducts. I’ve been massaging it, putting it under warm/hot water and nothing it still so sore. My baby won’t latch on to it idk of its bc it taste weird cause I read in an article that if you have mastitis then it’s salty. Can you guys help me in anyway? I really want to breastfeed this one.